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98% OSS
1% free-as-in-beer closed source software
1% in-browser tools
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IT News

A mix of industry and technical, traditional and next generation, dev and ops

Linux News and Articles

Linux-centric news and articles

Linux Message Boards and Forums

Resources for troubleshooting and technical questions

Mailing Lists - No link, there's like 4 trillion of them
IRC - Same as above
Arch Linux BBS - Official
Ask Fedora - Official
Ask Ubuntu - StackExchange
CentOS Forums - Official
Fedora Forums
JustLinux Forums
LinuxForums.org
LinuxQuestions.org
linux.stackexchange.com - StackExchange
Linux Mint Forums - Official
Red Hat Support Portal - Subscription required
serverfault.com - StackExchange
superuser.com - StackExchange
SUSE / SLES Support Portal and Knowledge Base - Official
SUSE Forums - Official
UbuntuForums.org - Official
Unix.com Forums

Asset Management

Asset management, inventories, asset discovery, CMDB, and IPAM - see also Configuration Management

Collins - Infrastructure source of truth, created by Tumblr -- Scala
iTop - IT Service Management (ITSM), asset tracking, and ITIL -- PHP
Fusion Inventory - Multi-lingual, can be paired with GLPI for a killer solution -- perl
Genesis - Hardware discovery, by Tumblr, can report to Collins -- Ruby
GestioIP - IP address management (IPAM), web based, supports discovery -- perl
GLPI - Also provides license management, software auditing, and ticketing -- PHP
IP Plan - IPAM -- PHP
ITDB (IT ITems DataBase) - Includes purchase order management, floor plans, and ISO20000-like features -- PHP
NetBox - IPAM and DCIM by Digital Ocean -- Python
Netdisco - Web-based network management and discovery tool, written in perl, uses SNMP -- perl
NIPAP - Next-generation IPAM -- Python
OCS-NG (OCS Inventory NG) - Automated inventory, deployment system, can sync with GLPI -- perl
openDCIM - Data center infrastructure management -- PHP
Open-AudIT - Track and report assets and configurations, supports Windows too -- PHP
phpIPAM - IPAM -- PHP
RackTables - Data center asset management, being updated again! -- PHP
racktables-contribs - RackTables user-contributed plugins -- PHP
Ralph - DCIM and CMDB, supports auto-discovery -- Python pip
Snipe-IT - Uses Bootstrap, web based, supports mobile -- PHP

AWS Tools

Tools for interacting with the Amazon Web Services ecosystem

Aminator - Create application-specific custom AMIs, by Netflix -- Python
assume-role - CLI tool making it easy to assume IAM roles through an AWS Bastion account -- shell
Awesome AWS - Curated list of AWS resources -- collection
aws-shell (formerly Supercharged AWS CLI (SAWS)) - The best CLI for interacting with AWS -- Python pip
aws-vault - A vault for securely storing and accessing AWS credentials in development environments -- Golang
AWS SAM Local - CLI tool for local development and testing of Lambda applications -- Golang
Chrome AWS SAML Token Expiry Reminder (CASTER) - Automatically re-logs into AWS via ADFS before credentials expire -- Chrome
CloudBerry Explorer - Windows client for accessing AWS S3 buckets -- closed source Windows
CloudCraft - Create professional AWS architecture diagrams -- in-browser
CloudMapper - Generates network diagrams of Amazon Web Services (AWS) environments and displays them via your browser, by Duo Security -- Python
credstash - Secrets management using AWS KMS -- Python pip
eb_deploy - Elastic Beanstalk blue-green deployment automation -- Ruby gem
ec2instances.info - Open source and up to date instance price comparison tool -- Python
haproxy-autoscale - Wrapper for haproxy that handles auto-scaling EC2 instances -- Python
Ice - AWS usage tool, by Netflix -- Grails
ION Roller - Immutable deployment framework for web services -- Scala
jungle - awscli wrapper to make commands simpler and more UNIX-like -- Python pip
kappa - CLI tool that makes it easier to deploy, update, and test Lambda functions -- Python
localstack - A fully functional local AWS cloud stack for offline dev and test -- Python
s3cmd - Backup to AWS via the command line -- Python
Serverless (formerly JAWS) - Javascript + AWS stack, the entire backend is Lambda functions, server-free -- JavaScript
Sneaker - Store secrets on S3 using Amazon KMS -- Golang
ssh2ec2 - SSH into EC2 instances by tag name and/or other metadata filters -- Python pip
StarCluster - Toolkit for using AWS for high performance computing (HPC), by MIT -- Python
Stout - Easy way to reliably upload a static website to S3, capable of configuring CloudFront and Route 53 -- Golang
Terraforming - Export all AWS resources into Terraform -- Ruby gem
Tools for Amazon Web Services - Amazon's portal for their official tools -- various lang
troposphere - Python library to create CloudFormation descriptions -- Python pip
Zappa - Build and deploy serverless, event-driven Python applications -- Python

Backups

Traditional backup software - see also Cloud File Sync and Sharing

Amanda - The classic -- C perl
Backupninja - Centralize way to configure and schedule many different backup utilities -- shell
BURP (BackUp and Restore Program) - Reduces network traffic and the amount of space required by using librsync -- C
BackupPC - Dedupe and a web GUI for restores -- perl
Backup - Gem for backup and restore, supports tons of platforms and notifiers (RDBMS, S3, Dropbox, rsync, Hipchat, Zabbix) -- Ruby gem
Bacula - Open source backup tool, lots of downloads so I guess it's good I don't know -- C
Back in Time - Similar to TimeMachine, simple GUI backup program -- Python
Bareos (Backup Archiving REcovery Open Sourced) - Fork of Bacula with additional features -- C
borgmatic - A simple wrapper script for the Borg backup software that creates and prunes backups-- Python
bup - Uses the git packfile format, supports global dedupe, can use "par2" redundancy -- Python
DAR (Disk ARchive) - Better than tar, focuses on disks instead of tapes -- C++
ddrecover - This should be the first data recovery tool you use -- C
Deja Dup - GUI for duplicity -- C
Duplicati - Supports encryption and dedupe -- Mono
Duplicity - Encrypted bandwidth-efficient backup using the rsync algorithm -- Python
Elkarbackup - Comes as a ready to use VM, supports Linux and Windows -- PHP
Fpart - Packs file systems into "partitions" so you can do multi-threaded or multi-node rsyncs -- C
FSArchiver - Save the contents of a file system to a compressed archive, if one of the checksums doesn't match the file is lost, not the whole backup -- C
Grsync - GUI for rsync -- Windows OS X C
Mondo Rescue - Disaster recovery, supports tapes, disks, network and CD/DVD as backup media, multiple filesystems, LVM, software and hardware RAID -- C
rdiff-backup - Combines the best features of a mirror and an incremental backup in a bandwidth efficient manner -- Windows OS X Python
Redo Backup and Recovery - Simple bare metal backup and restore, live CD -- Windows
Relax and Recover (REAR) - BMR, simple, integrates with commercial backup solutions -- shell
rsnapshot - Uses rsync and hard links, can keep multiple full backups available while using very little disk space -- OS X perl shell
SafeKeep - Superb project, uses LVM snapshots -- Python
SnapRAID - Backup program that also stores RAID parity information -- C
Unison - Multi-OS file sync tool, syncs from both sides, no master -- OS X
UrBackup - Supports Windows, has a web interface -- Windows C++
ZBackup - Globally deduplicating backup tool -- C
zpaq - Free incremental and journaling command-line archiver -- Windows OS X C++

Chef

Chef gets it's own category because they're MY links - see also Configuration Management

Bento - Chef's collection of baseboxes configured to work with Packer and Vagrant, great for testing -- Ruby
Berkshelf - Like gem bundler for Chef cookbooks, manages dependencies -- Ruby gem
Chake - Tool that helps you manage multiple hosts with chef-solo, think simple mini self-contained Chef (no server) -- Ruby gem
chef-guard - feature rich Chef add-on that protects your Chef server from untested and potentially dangerous cookbooks -- Ruby
chef-vault - Allow specified node(s) to dencrypt the contents of encrypted data bags -- Ruby gem
chef-whitelist - Library that enables easy rollout of changes to one or more hosts, by Etsy -- Ruby
ChefDK (Chef Development Kit) - Includes Berkshelf, Test Kitchen, ChefSpec, Foodcritic, Knife, Chef Zero, Ohai, and more -- Ruby
ChefSpec Examples - A billion code snippets and tests for ChefSpec -- Ruby
Chef Partner GitHub Repos - Official repo for tools, provisioners, and knife plugins from partners (VMware, GCE, Azure, AWS, etc) -- collections
Chef Sugar - Syntactic sugar for Chef by Seth V -- Ruby gem
Chef Supermarket (community) - Official community site for cookbooks -- various lang
Chef Supermarket (self-hosted) - Cookbook repository for Chef, can be hosted internally -- Ruby
Citadel - Cookbook to store secrets in AWS S3 buckets using EC2 and IAM -- Ruby
Foodcritic - Chef linter and static code analysis -- Ruby gem
grocery-delivery - Utility for managing cookbook uploads to distributed Chef backends, by Facebook -- Ruby
Handlers - The official list of community written handlers (Airbrake, IRC, Campfire, etc) -- Ruby
Itamae - CM tool inspired by Chef, but simpler and lightweight, formerly LightChef -- Ruby gem
Inspec - Drop-in replacement for ServerSpec, can be used for audit purposes too -- Ruby gem
knife-backup - Knife plugin to help backup and restore a Chef server -- Ruby gem
knife-push - Official push jobs - action or a command to be executed against a subset of nodes -- Ruby
Knife Plugins - The official list of community written plugins for Knife -- collection
omnibus - Create full-stack installers for your project -- Ruby gem
Policy File - Policyfile is a single document to specify the cookbooks and recipes that should be applied to node(s) -- official experimental
Ridley - Chef API client -- Ruby gem
ServerSpec - RSpec tests for your servers configured by Puppet, Chef or anything else -- Ruby
spiceweasel - Quickly automates the creation of whole Chef environments (batch loading) -- Ruby
Test Kitchen - Automated testing for configuration management tools (mostly Chef) -- Ruby gem

Cloud File Sync and Sharing

Sync files to and share from public or private file stores (think Dropbox, Google Drive, etc) - see also Backups

boar - Stores snapshots of directory trees in a local or remote repository, for BLOBs (pictures, videos , etc) -- Python C
Drive - Push or pull files to Google Drive via the command line -- Golang
git-annex Assistant - Sync folder(s) to any device (NAS, mobile, thumb, cloud, etc) via git -- C OS X mobile
lsyncd - Watches a local directory trees event monitor interface (inotify or fsevents) and kicks off an rsync when things change -- Lua
Mackup - Sync your Mac application settings to various cloud services or git -- Python OS X
Nextcloud - Fork of and replacement for OwnCloud, a self-hosted Dropbox -- various lang Windows OS X
Pydio - Formerly AjaXplorer, AGPL license -- PHP
Seafile - Also offers a paid professional edition with more features, supports most platforms -- C
SparkleShare - Uses git under the hood, neat -- Windows OS X
Syncany - Supports tons of different protocols for the transfer (SCP, FTP, Samba, S3, etc) -- Gradle
Syncthing - Uses an ID rather than an IP address, share your ID with friends and go -- Golang
Tahoe-LAFS - Free and open decentralized cloud storage system -- Python

Collaboration Tools

ChatOps, code review, groupware, webmail, code sharing, and more - see also Dashboards and Data Visualization and Graphics Stuff and Editors and Git Tools and Software Development Tools

Citadel - Messaging, collaboration tools, and groupware - an all-in-one package -- C
dev-setup - Automated setup scripts for laptop tools like Sublime Text, AWS, Spark, Android dev, and more -- collection
Etherpad - Enter, save, and share text/code in a web browser -- JavaScript
FreeIPA - Identity, policy, and audit suite, think Active Directory for Linux (LDAP, CA, x509, DNS, Kerberos) -- various lang
FreeMind - OSS mind mapping software, great for brainstorming -- Java Windows OS X
gcalcli - CLI for Google Calendar -- Python pip
gmvault - Export/backup and restore your Gmail account -- Python
Haste / hastebin - Open source pastebin alternative for sharing code, can be installed locally / on-site -- JavaScript
Hubot - Chat bot that can do deploys, look up images, integrate with Google Maps, and tons of other stuff -- CoffeeScript
Isso - A commenting server similar to Disqus -- JavaScript
Kolab - Unified communication and collaboration system -- PHP
LDAP Account Manager (LAM) - Full featured LDAP management GUI, can manage almost anything -- PHP
Let's Chat - Self-hosted open source HipChat clone -- JavaScript
Mattermost - OSS Slack alternative -- Golang JavaScript
Mailtrain - Self hosted news letter e-mail app, similar to Mailchimp -- JavaScript
OpenProject - Web-based project management system built on Ruby on Rails -- Ruby
osTicket - Routes inquiries created via email, web-forms and phone calls into a web-based customer support platform -- PHP
OTRS - Open source help desk software -- perl
OwnTracks - Self-hosted location tracking you can share - use for diaries, work orders, etc -- various lang mobile
Pandoc - Convert files from one markup format to another, supports a ton of formats -- Haskell
Phabricator - Suite of web-based software dev collaboration tools, and all-in-one project management tool -- PHP
PrivateBin - Pastebin where the server has zero knowledge of pasted data, data is encrypted/decrypted in the browser using 256 bits AES -- various lang
QueryClips - Pastebin for Postgres or my mySQL SQL query sharing -- in-browser
RainLoop - Simple, modern & fast web-based email client -- PHP
Redmine - Project management webapp -- Ruby
Request Tracker - Bug tracking, help desk ticketing, customer service, workflow processes, change management and more -- perl
Review Board - Code review tool for multiple SCM systems -- Python
Rocket.Chat - OSS Slack clone built with Meteor.js -- JavaScript
Roundcube - Browser-based multilingual IMAP client -- PHP
Say What - Using speech-to-text to fully check out during conference calls -- Python
Scribus - Open source desktop publishing (layout, typesetting, etc), Adobe InDesign alternative -- C++ Windows OS X
SOGo - Groupware that integrates with Microsoft, Android, and Apple products -- Objective-C OS X
Sovereign - Set of Ansible playbooks to deploy a suite of self-hosted apps (mail, colab, calendar, file sync, and more) -- Python
Synergy - Share a single keyboard and mouse with multiple physical computers, only the old version is free now -- closed source Windows OS X
Taiga - Project management web application with agile/ scrum in mind -- Python CoffeeScript
TermRecord - Record and playback terminal sessions, outputs self-contained HTML -- Python
VisioCafe - The largest collection of free Visio stencils -- collection
WeKan - OSS Trello-like kanban board -- JavaScript
YOURLS (Your Own URL Shortener) - Lets you run your own URL shortener a'la TinyURL or bit.ly -- PHP
Zulip - Group chat with chat threads, by Dropbox -- various lang mobile Windows OS X

Configuration Management

OS-level configuration management, Chef has it's own category because - see also Asset Management and Orchestration and Package Patch and Repository Tools

Ansible - CM and orchestration, also can do provisioning -- Python
Ansible Galaxy - Community site for finding, reusing, and sharing Ansible content -- various lang
Ansible Interactive Tutorial - Interactive tutorials for Ansible via Docker, super simple -- Shell
Automatic Server Hardening - Linux hardening cookbooks/manifests/playbooks for Puppet, Chef, and Ansible -- various lang
awx - Upstream to Ansible Tower - REST API, task engine, etc -- Python
Blueprint - Reverse engineer a server configuration -- Python pip
BOSH - Cloud orchestration, supports Docker containers too -- Ruby
Boxen - Mac / OS X configuration management -- Ruby gem OS X
hiera-eyaml - Backend for Hiera that provides per-value encryption of sensitive data within Puppet yaml files -- Ruby
Juju - Ubuntu focused but works on RHEL / CentOS now -- Golang
librarian-puppet - Bundler for Puppet, manages dependencies -- Ruby gem
Oxidized - RANCID replacement, supports many platforms (Cisco, Brocade, Juniper, Citrix, etc) -- Ruby gem
puppet-lint - Check that your Puppet manifest conform to the style guide -- Ruby gem
Puppet Dashboard - Web based dashboard for Puppet -- JavaScript
Puppet Forge - The official community repository of Puppet modules -- collection
puppet-module-skeleton - Skeleton modules for Puppet -- Ruby
r10k - General purpose toolset for deploying Puppet environments and modules -- Ruby gem
RANCID - (Really Awesome New Cisco confIg Differ) - Pulls and saves network device configs and saves them into a CVS, now supports git -- C
Rudder - Automation and compliance, uses CFengine -- Scala
Salt / Saltstack - Orchestration, server provisioning, and configuration management -- Python

Containers

Linux containers, container orchestration, provisioning, networking, PaaS, Kubernetes, and related tools - see also Distributed Systems Tools and Virtualization and SDN and Web and HTTP Tools

Alpine Linux - Super minimal BusyBox based Linux distro, perfect for hosting containers -- various lang
appscale - Open source implementation of Google App Engine -- Python
Awesome Docker - Massive Docker collection -- collection
Awesome Kubernetes - Collection -- collection
cadvisor - Analyzes resource usage and performance characteristics of running containers -- Golang
Clear Linux - New name for Clear Containers, attempts combine the security advantages of VMs with the deployment advantages of containers -- various lang
Cloud Foundry - Open source PaaS by VMware and Pivotal -- Golang Ruby
crane - Docker orchestration, similar to Docker Compose -- Golang
ctop - ncurses top-like UI for containers -- Golang
docker-gc - Docker garbage collection of containers and images -- shell
DockerSlim - Uses static and dynamic analysis to create skinny image variants of your fat images -- Golang
Docker Compose - Define and run multi-container apps with Docker, previously known as fig, official -- Python
Docker Distribution - AKA Docker Registry 2.0 - pack, ship, store, and deliver containers -- Golang
Docker Hub - Official Docker images for many projects -- various lang
Docker Swarm - Docker-native clustering system -- Golang
Docker Swarm Visualizer - A visualizer for Docker Swarm using the Docker Remote API, Node.JS, and D3 -- JavaScript
Docker Toolbox - Docker Client, Machine, Compose, Kitematic, VirtualBox, and the boot2docker VM in a single package, official -- various lang
Dokku - Docker powered mini-Heroku (PaaS) in around 100 lines of bash -- shell
draft - Streamlined Kubernetes development with sandbox testing & deployment in seconds -- Golang
drone - CI platform built on Docker / containers, can also deploy to Kubernetes -- Golang
dumb-init - Minimal init system for containers, by Yelp -- C
Fabric8 - Open source microservices platform based on Docker, Kubernetes and Jenkins -- Java
Flannel - Network fabric for containers via etcd, designed for Kubernetes -- Golang
Flynn - PaaS built on top of Docker, can run stateful services -- Golang
Heapster - Container cluster monitoring and performance analysis for Kubernetes and CoreOS -- Golang
Helm - tool for managing Kubernetes charts (packages of pre-configured Kubernetes resources) -- Golang
helm-value-store - Manage working with multiple values.yaml files for nearly identitcal deployments -- Golang
Heptio Ark - Manage disaster recovery for your Kubernetes persistent volumes and cluster resources -- Golang
Heptio Sonobuoy - Kubernetes end to end conformance testing and debugging tool -- Golang
Kata Containers - A mix of Clear Containers / Clear Linux and Hyper's runV -- frankencontainers various lang
Kismatic - Set of production-ready defaults and best practice tools for creating enterprise-tuned Kubernetes clusters, supports bare metal. -- Golang
Kitematic - GUI Docker management on Mac & Windows (laptops), official -- JavaScript Windows OS X
kops - CLI for managing, upgrading, maintaining, creating, etc Kubernetes clusters -- Golang
kubeadm-dind-cluster - kubeadm and DIND (Docker in Docker) create a multi-node Kubernetes cluster on your laptop for dev -- Shell
kube-applier - service that enables continuous deployment of Kubernetes objects by applying declarative configuration files from a Git repository to a Kubernetes cluster -- Golang
kube-bench - Compliance checker for Kubernetes CIS benchmarks -- Golang
kubectx - Easily switch between kubectl contexts and namespaces -- Ruby
kubed - Perform periodic cluster snapshots, provide temp storage for deleted objects, automatic event forwarding, deliver notifications via various channels for Kubernetes -- Golang
kubernetes - Open source orchestration system for Docker containers, by Google -- Golang
kubicorn - Multi-provider deployment abstraction layer / library for Kubernetes -- Golang
Logspout - Log router for Docker containers -- Golang
minikube - Kubernetes environments on your laptop -- Golang
Minishift - OpenShift in a VM for testing / learning -- Golang
OpenShift Origin - Docker + Kubernetes, the upstream for Red Hat's OpenShift 3.x -- Golang
Panamax - Containerized app creator with an open-source app marketplace hosted in GitHub -- various lang
pipework - SDN for Linux Containers -- various lang
Portainer - Web interface for Docker aka us-for-docker -- JavaScript
Project Atomic - Super stripped down Linux OS designed to only run containers and nothing more, aka RHEL Atomic -- various lang
Prometheus Operator - Creates/configures/manages Prometheus clusters atop Kubernetes -- Golang
Rancher - Provides a complete platform for operating Docker in production -- various lang
Registrator - Service registry bridge for Docker, supports Consul, etcd -- Golang
rkt (Rocket) - New container system by the CoreOS guys -- Golang
Rocker - Adds new instructions to the Dockerfile instruction set for smaller images and faster builds -- Golang
Tectonic Installer - Install an opinionated Kubernetes cluster the "Tectonic Way", a sane predefined deployment and workflow -- various lang
Telepresense - Local development against a remote Kubernetes or OpenShift cluster -- Python
Tsuru - Docker-based PaaS -- Golang
Watchtower - Monitors your running Docker containers and restart them when a new image is available -- Golang
Weave - Virtual network that connects Docker containers deployed across multiple hosts -- Golang

Dashboards and Data Visualization

Dashboards for monitoring, alerting, metrics, data visualization tools, and status boards - see also Metrics and Time Series Data and Logging and Monitoring and Alerting

Bigdesk - Live charts and statistics for Elasticsearch cluster -- JavaScript
Cachet - Create beautiful, responsive status pages -- PHP
Cacti - Web-based network monitoring and graphing tool designed as a front-end to RRDtool -- PHP
CactiEZ - Super simple, added features, works right out of the box -- PHP
Dashing - The exceptionally handsome dashboard framework, no longer maintained, successor is Smashing -- Ruby gem
Dashing Widgets - Massive collection of widgets for Dashing -- collection
Facette - Time series data visualization and graphing software -- Golang
Flame Graphs - Stack trace visualizer by Brendan Gregg -- perl
Gource - Software version control visualization tool -- C++
Graphene - Graphite dashboard in D3 and Backbone -- JavaScript
Graphiti - Graphite dashboard using Ruby and Redis -- Ruby
Hygieia - Visualize near real-time status of the entire delivery pipeline, by Capital One -- Java
Hystrix Dashboard - Dashboard for Netflix's Hystrix tool -- Java
Kibana - Visualization component of the ELK stack -- JavaScript
ksar - Creates pretty graphs from sar output -- Java
logstalgia - Web site access log visualization tool, aka Apache Pong -- C++
Grafana - Modern dashboard for Graphite -- JavaScript
Mozaik - Create beautiful dashboards using Node/React/D3 -- JavaScript
MRTG (Multi Router Traffic Grapher) - Still being updated -- perl
Nagdash - Dashboard / NOC screen for Nagios -- PHP
NagVis - Visualization suite for Nagios -- PHP
Nagiosgraph - Another visualization tool for Nagios data -- perl
Network Weathermap - Network visualization tool, create a "weather map" just like big ISPs use, not dead yet -- PHP
pdash - web dashboard for linux using data mainly served by psutil -- Python pip
PNP4Nagios - Analyzes performance data provided by plugins and stores them automatically into RRD-databases -- PHP
promviz - Visualize the traffic of your clusters in realtime from Prometheus data -- Golang
redash - Web application that allows to easily query an existing database, share the dataset and visualize it in different ways -- various lang
ServerStatus - Display and monitor your servers statistics in a beautiful way -- C C++ JavaScript
Seyren - Alerting dashboard for Graphite -- Java
Smashing - Successor to Dashing -- Ruby
Stashboard - Status dashboard for APIs and software services, requires Google App Engine -- Python
Staytus - Complete solution for publishing the latest info about issues with your web applications, networks or services -- Ruby
Tasseo - Dashboards using D3, HTML5, Bootstrap, and others -- JavaScript CoffeeScript
Tessera - Graphite dashboard in Python -- Python pip
Thruk - Web interface for Nagios, Icinga, Shinken and Naemon, can create SLA reports, has a mobile client -- JavaScript
Uchiwa - Dashboard for Sensu -- Golang
vnstati - Creates PNG images using vnStat data -- built-in

Distributed Systems Tools

DCOSes, microservices, service discovery, schedulers, Mesos, and related tools for dynamic, warehouse-scale computing - see also Containers and HPC Tools

Aurora - Mesos scheduler for long running services and cron jobs, similar to Marathon -- Java
Avro - Data serialization system with backwards compatible schemas -- Java
Bamboo - HAProxy auto configuration and auto service discovery for Mesos and Marathon -- Golang
Celery - Async task/job queue based on distributed message passing -- Python
Chaperone - End-to-end Kafka auditing (data loss, latency, message duplication, etc), by Uber -- Java
Chronos - Distributed, fault tolerant cron scheduler that runs on top of Apache Mesos -- various lang
Cruise Control - Fully automate the dynamic workload rebalance and self-healing of a cluster, by Linkedin -- Java
consul - Service discovery and configuration via DNS or HTTP, great for auto-scaling -- Golang
consul Tools - Official, includes consul-template and others -- various lang
Curator - ZooKeeper client wrapper and rich ZooKeeper framework, by Netflix -- Java
DC/OS - Pre-configured data center OS distribution that includes Mesos, Marathon, AdminRouter, and more -- Python
Envoy Proxy - Sidecar container for distributed applications or microservices, data plane service mesh / edge proxy -- C++
etcd - Distributed, consistent key-value store for shared configuration and service discovery -- Golang
eureka - AWS Service registry for resilient mid-tier load balancing and failover, by Netflix -- Java
fabio - Zero-conf load balancing HTTP(S) router for deploying microservices managed by Consul, by eBay -- Golang
Flink - Next-generation true stream processing platform for real-time analytics -- Java
Hystrix - Library to stop cascading failures -- Java
Ignite - General-purpose in-memory platform for in-memory computing use cases -- Java
Istio - Envoy + auth, policy enforcement, telemetry, traffic flow management etc control plane that runs on top of Mesos and Kubernetes, service mesh control plane -- various lang
jespen - A framework for distributed systems verification, with fault injection -- Clojure
Kafka - Stream processing platform (logs, IoT metrics, anything) -- Java
Kong - Microservice / API management layer -- Lua
linkerd - RPC proxy and request routing for microservices, includes service discovery, instrumentation, and load balancing, data plane service mesh -- Scala
LogDevice - A distributed data store for logs, by Facebook -- C++
Mantl - Complete microservices infrastructure built using OSS tools by Cisco -- various lang yowza
Marathon - Mesos scheduler for "always on" jobs (eg: web services) -- Scala
MaxScale - General purpose DB query proxy, router, and load balancer, by MariaDB -- C
mcrouter - memcached protocol router for scaling memcached, by Facebook -- C++
Mesos - Cluster manager and scheduler, similar to Google's Borg and Omega projects -- C++
mesos-consul - Automatically registers/deregisters services run as Mesos tasks -- Golang
Mesosphere - Apache Mesos schedulers for almost anything, commercial support is available -- C++
miniMesos - Spin up Mesos clusters on your OS X laptop, can be used for TDD too -- Java
Mitogen - Python library for writing distributed self-replicating programs like magic -- Python
nsq - Realtime distributed messaging platform / message queue -- Golang
Pinpoint - Application Performance Monitoring (APM) for distributed systems, based on Dapper -- Java
Pulsar - A Kafka alternative, by Yahoo -- Java
redis-cell - Redis module that provides rate limiting in Redis as a single command using GCRA -- C
Redisson - Distributed and scalable Java data structures on top of Redis -- Java
Riemann - Aggregates events from your servers and applications with a powerful stream processing language, for distributed systems, similar to Borgmon -- Clojure
Ringpop - Fault tolerant application-level sharding for Golang or Javascript -- JavaScript Golang
Serf - Decentralized solution for service discovery and orchestration -- Golang
SkyDNS - Service discovery via DNS for etcd -- Golang
Spark - Near real-time analytics processing platform, succeeded by Flink (real streaming vs Spark's microbatches) -- various lang
Spring Cloud Config - Allows Java Spring to read config info from service discovery or similar source -- Java
Synapse - Service discovery framework by Airbnb -- Ruby
uReplicator - Improved Kafka MirrorMaker by Uber -- Java
vulcand - Programmatically extendable proxy for microservices and API management -- Golang
Zookeeper - Distributed configuration service, synchronization service, and naming registry -- Java

Editors

IDEs, text & source editors, vim plugins, and similar tools - see also Graphics Stuff and Collaboration Tools

010 Editor - Professional hex editor that supports binary templates for easy reading, scripting, and more -- closed source
activate-power-mode - Activate POWER MODE and write code in style, an Atom plugin -- CoffeeScript
Atom - Superb text editor, created by GitHub -- CoffeeScript
Atom Vim Mode - vi/vim style controls for Atom -- CoffeeScript
Atom Linters - A collection of lint tools for the Atom editor -- various lang
Brackets - Modern editor that understands and focuses on web design, by Adobe -- JavaScript
LargeFile - vim plugin that automatically disables certain things so you can edit large (multi-gig) files faster -- vim
Light Table - Next-generation editor that gives you instant feedback -- Clojure
Lime - Open source API-compatible alternative to Sublime Text -- various lang
livedown - Live, in-browser markdown previews for vim and Sublime -- various lang
MacDown - Markdown editor and live preview for Mac -- Objective-C OS X
MacVim - Has far more features than the vim that's included with the OS -- C
Nuclide - Collection of packages for Atom to provide IDE-like functionality for a variety of programming languages and technologies, by Facebook -- JavaScript
Notepad++ - Killer GPL'ed text editor for Windows -- C++
OpenVim - In-browser vim tutorial -- JavaScript in-browser
percol - Interactive grep (search) tool -- Python
Powerline - Provides various statues on the bottom of your session, flexible -- Python
Textmate - GUI text editor for OS X -- C++
UltiSnips - The ultimate snippet solution for vim -- Python
vim-json - A better JSON plugin for vim -- vim
vim-snippets - snipMate & UltiSnip snippets -- vim
Vimium - Chrome extension that provides vi/vim style shortcuts for navigation and control -- CoffeeScript Chrome
Vundle - Popular plug-in manager for vim -- vim
wasavi - vim/vi controls in browser text areas -- JavaScript Firefox Chrome
wxHexEditor - Free hex editor, disk editor, and big file editor for Linux, Windows and Mac OS X -- C
YouCompleteMe - Fuzzy-search code completion engine for vim -- Python

Git Tools

Tools for interacting with git and GitHub - see also Software Development Tools

BFG Repo-Cleaner - Scrub large blobs and sensitive data from git history -- Scala
blackbox - Safely store secrets in Git, by Stack Exchange -- shell
Completion - Shell tab completion for git branch names -- shell
Gerrit - Web based code review and repo management for Git -- Java
git-fat - Like git-media but without the Ruby dependencies -- Python
GitKraken - Probably the best multi-platform git GUI -- closed source Windows OS X Linux
GitHub Pull Request Builder Plugin (gprbp) - Jenkins plugin that allows certain comment strings to kick off builds or take other actions -- Java
GitLab - Kinda like an open source GitHub, has both a community and paid version -- Ruby
GitLab CI - CI that integrates with GitLab -- Ruby
GitRob - Scan repos for sensitive information -- Ruby
gitsome - Supercharged CLI with GitHub integration -- Python
GitUp - Maybe the best git GUI -- Objective-C
gitwatch - Automatically commit changes when specified files or directories are modified -- shell
Git Interfaces, Frontends, and Tools - Massive list on the official kernel.org wiki -- various lang
Gogs - Painless, self-hosted Git service written in -- Golang
hub - Official CLI for GitHub -- Golang
myrepos - Flexible tool for managing many repos -- perl
Signing - Sign commits and/or tags using GPG keys to verify the identity of the commiter -- built-in

Graphics Stuff

Not everything happens in the browser or on the command line - see also Collaboration Tools and Data Visualization and Dashboards

Avidemux - Simple, all-in-one, GUI video editor and converter -- C++ Windows OS X
Blender - 3D graphics software for animated films, visual effects, art, 3D printed models, and more -- C Python Windows OS X
blockdiag - Generate simple block/sequence/activity/network diagrams from text files -- Python pip
Darktable - Photography workflow application and RAW developer, Adobe Lightroom replacement -- C OS X
draw.io - Free online flow chart maker / Visio alternative, can be self-hosted -- in-browser
GlyphSearch - Search for icons from Font Awesome, Glyphicons, IcoMoon, Ionicons, and Octicons -- collection
GIMP (GNU Image Manipulation Program) - Open source Adobe Photoshop replacement -- C
Graphviz - Graph visualization and flow chart software -- wacky license
Greenshot - The best Windows screenshot tool -- C# Windows
Inkscape - Open source vector image editor, Adobe Illustrator replacement -- C C++ Windows Mac
LICEcap - Capture an area of your desktop and save it to a GIF -- C Windows OS X
mac2imgur - Auto-upload screenshots to Imgur -- Swift OS X
maim - The most powerful and flexible Linux desktop screenshot tool -- various lang
Media Player Classic - Home Cinema (MPC-HC) - Open source media player for Windows -- C++ Windows
OpenShot - Video editing software, 2.0 will support other additional platforms -- Python Windows OS X
Origami - Interactive UI design prototyping without programming, by Facebook -- various lang
Pencil - Open source GUI prototyping and mockup tool, supports all platforms -- Windows OS X
ShareX - One of the best screenshot/screencast capture and sharing tools for -- Windows OS X
Skitch - Feature-rich screenshot editing, sharing, and annotation tool Mac/OS X -- closed source
VLC Media Player - Media (music, video, etc) player and streaming server -- C Windows OS X
yEd Graph Editor - Flowcharts and UML diagrams -- closed source

High Availability Clustering Tools

HA clustering tools including storage replication, failover, VIPs, and more - see also Distributed Systems Tools and Containers

AN! Cluster Tutorial 2 - Building clusters with OSS software, very detailed -- article
Cluster Manager (cman) - Clustering framework that's built into RHEL/CentOS/Fedora -- built-in
Corosync - HA framework and cluster engine -- C
csync2 - General purpose cluster file sync tool -- C
DRBD (Distributed Replicated Block Device) - Mirror block devices to a remote system aka replication -- C
Ganeti - Wrappers around existing tools to make it easy to create HA clusters, by Google -- Python
HAproxy - Open source software load balancer -- C
haproxyctl - Wrapper to talk to the HAProxy socket, as well as regular init (start stop restart) shit -- Ruby
keepalived - Load balancing and high availability -- C
huptime - Zero downtime restarts of unmodified programs -- C
Linux-HA - Building blocks for high availability systems -- wiki-and-collection
LVS (Linux Virtual Server) - Linux-based load balancer, also includes the IPVS kernel module -- C
Multibinder - Simple Ruby daemon that makes true zero downtime reloads simple, by Github -- Ruby
Pacemaker - HA resource manager -- C
rcron - cron redundancy and failover, ensures a job will only run on the "active" machine -- lost-to-the-internet C
rmanager - Resource group manager daemon for cluster services -- built-in
Seesaw - Load balancer based on Linux Virtual Server (LVS), by Google -- Golang
Traefik - Modern HTTP reverse proxy and load balancer, supports many backends -- Golang
UCARP - VIP management using the CARP protocol -- C

HPC Tools

High performance computing for simulations, supercomputing, shared memory systems, and grid computing - see also Distributed Systems Tools and Containers

Clustered File System - Ceph, GlusterFS, Lustre, etc, take your pick -- various lang
HTCondor - Workload management system for compute-intensive jobs, formerly Condor
Maul Cluster Scheduler - Precursor to the Moab HPC Suite
MPI for Python (mpi4py) - Python bindings for the Message Passing Interface (MPI) standard
MPICH - High-performance and widely portable implementation of the Message Passing Interface (MPI) standard
MUNGE - Authentication service for creating and validating credentials, designed for HPC
MVAPICH2 - MPI-3 over OpenFabrics-IB, OpenFabrics-iWARP, PSM, and TCP/IP
OpenMP - API that supports multi-platform shared memory multiprocessing programming in C, C++, and Fortran -- article
OpenMPI - Popular Message Passing Interface (MPI) library -- C
Open Grid Scheduler - Formerly known as Sun Grid Engine -- C
OSCAR (Open Source Cluster Application Resources) - Makes it easy to create a Beauwulf-type HPC cluster
Rocks Cluster Distribution - Linux cluster distribution that enables end users to easily build computational clusters, grid endpoints and visualization displays
Slurm (Simple Linux Utility for Resource Management) - One of the mostly widely used schedulers
StarCluster - Toolkit for using AWS for HPC, by MIT -- Python
TORQUE (Terascale Open-source Resource and QUEue Manager) - An updated and extended version of Portable Batch System (PBS)

Live CD Tools

Security, recovery, bootable USB/CD/DVD creation tools, diagnostics, and more - see also Security Tools and Backups and Provisioning Tools

BlackArch Linux - Penetration testing Linux distro, based off of Arch Linux -- various lang
Buscador - Live CD Linux distro preconfigured for online investigators -- various lang
CAINE (Computer Aided INvestigative Environment) - Computer forensics on a live CD -- various lang
DBAN (Darik's Boot and Nuke) - Spinning disk wiper -- various lang
Easy2Boot - Create multiple bootable Linux ISOs on the same USB drive -- Windows
GParted Live - Small, bootable ISO that contains gparted - great for resizing a non-LVM root file system -- C
Kali Linux - Penetration testing Linux distro -- various lang
Network Security Toolkit (NST) - Live CD that includes most tools in insecure.org's top 125 tools list -- various lang
NirLauncher - USB live distro that contains all of the NirSoft utilities and more, essential for Windows -- closed source Windows
PALADIN - Easy to use Linux-based live CD for forensic analysis -- various lang
Rufus - Create bootable USB flash drives -- Windows
Security Onion - Linux distro for IDS, NSM, and log management -- various lang
Stresslinux - Hardware burn-in and stress testing -- various lang
System Rescue CD - System recovery CD that focuses on Linux system recovery -- various lang
Ultimate Boot CD (UBCD) - Tons of x86 diagnostic and stress test tools on a single CD -- closed source Windows
UNetbootin - Create custom, bootable USB Linux CDs -- Windows OS X
YUMI - Multiboot USB creator, Linux and -- Windows

Logging

Log management, analysis, analytics, and collection from any source - see also Data Visualization and Dashboards and Metrics and Time Series Data and Monitoring and Alerting

Adiscon LogAnalyzer - Slick web interface for syslog messages -- PHP
Countly - Mobile and web analytics and marketing platform -- JavaScript
ElasticDump - Import / export tools for Elasticsearch -- JavaScript
ElasticHQ - Does not yet support ES 5.x -- JavaScript
Elasticsearch - Component of the ELK stack, used for super fast searches -- Java
Elasticsearch Exporter - Script to import/export data from ElasticSearch to various other storage systems -- JavaScript
Eliot - Outputs causal chains of actions happening within and across process boundaries aka a logical trace of the system’s operation -- Python pip
Errbit - Self-hosted error catcher, Airbrake API compliant -- Ruby
Filebeat - By Elastic, the next generation Logstash Forwarder -- Golang
Fluentd - Unified logging layer -- Ruby gem
Flume - Distributed, reliable, and available service for efficiently collecting, aggregating, and moving large amounts of log data -- Java
GoAccess - Real-time web log analyzer and interactive viewer that runs in a terminal and/or dashboard -- Windows OS X
Graylog2 - Log capture and analysis -- various lang
IRCcat - Send log messages and alerts to an IRC channel, can also use IRC to send commands -- Java
lnav - Advanced log file viewer for the small-scale, terminal/ncurses based -- C++
Log Courier - Enhanced fork of Logstash Forwarder -- Ruby
Logplex - Distributed syslog log router, uses Redis, by Heroku -- Erlang
logstash - Collect, parse, and store logs. A component of the popular ELK stack -- Ruby
Logster - Utility for reading log files and generating metrics to configurable outputs by Etsy -- Python
Logwatch - Monitor logs and send an e-mail when event(s) occur -- perl
Mamomo - Web analytics platform with a killer UI, formerly PIWIK -- PHP
multilog - Reads a sequence of lines from stdin and appends selected lines to any number of logs -- DJB
multitail - Monitor multiple log files in a single terminal window -- C
netconsole - Kernel module that sends kernel log messages (dmesg, etc) to a remote system without using syslog -- C
NXLOG - Universal log collector and forwarder, supports many formats/platforms/sources including Windows -- C Windows
Open Web Analytics (OWA) - Track and analyze how people use your websites and applications -- PHP
Sentry - Application exception logging -- Python
Snoopy Logger - Logs commands that are executed and saves the information to syslog -- C
Snowplow - Web, mobile and event analytics -- Scala
swatch - Simple log watcher -- built-in
Webalizer - Web and FTP log analyzer -- C

Metrics and Time Series Data

Collection, analysis, and storage of metrics, telemetry, and instrumentation data from almost any source - see also Dashboards and Data Visualization and Monitoring and Alerting and Logging

Banshee - Real-time anomalies detection system for periodic time series -- JavaScript
collectd - Collects system performance statistics -- C
collectd Related Sites - Great tools that integrate with collectd -- collection
collectl - sar on steroids -- C
Diamond - Python daemon that collects system metrics and publishes them to Graphite (or similar), has an API -- Python
dim_STAT - Collects almost everything and stores it in a MySQL database, produces reports too -- C
FastForward - Flexible system event and metric forwarding agent by Spotify -- Ruby gem
Ganglia - Focused on HPC / distributed clusters, uses RRD -- various lang
Graphite - Store numeric time-series data and render graphs of the data on demand -- Python
Graphite Tools - Tools that work with Graphite -- collection
Heka / hekad - Stream processing, can gather logs or performance metrics, by Mozilla, based on Borgmon -- Golang
InfluxDB - Distributed time series database with no external dependencies -- Golang
jmxtrans - Connector between speaking to a JVM via JMX and whatever stats / TSDB you use -- Java
KairosDB - Time series DB written on top of Cassandra -- Java
Metrics - Metrics and instrumentation at both the JVM and application level -- Java
Micrometer - Provides a simple facade (fake interface) over the instrumentation clients for the most popular monitoring systems, allowing you to instrument your JVM-based application code without vendor lock-in -- Java
OpenTSDB - Store and serve massive amounts of time series data without losing granularity -- Java
Prometheus - Metrics collection and storage, can trigger alerts when thresholds are breached, based on Borgmon -- Golang
Sensu - Open source monitoring framework, cloud-focused, dynamic, scalable - also does metrics collection -- Ruby
Skyline - Real-time anomaly detection system to enable passive monitoring of metrics without the need to configure thresholds -- Python
SNMPcollector - SNMP collector that saves into InfluxDB for easy visualization -- Golang JavaScript
SNMP MIB Archive - Massive archive of SMMP MIBs, please fork and contribute -- collection
StatsD - Network daemon that listens for stats/counters/metrics and sends them to backend services (TSDB, Graphite, etc), by Etsy -- JavaScript
Telegraf - Agent for collecting, processing, aggregating, and writing metrics -- Golang
TimescaleDB - PostgreSQL extension for time series ingestion and queries via SQL -- C
Whisper - Store time series info in regular file system files, a modern RRD -- Python

Monitoring and Alerting

Monitor stuff, send alerts, wake you up - see also Metrics and Time Series Data and Logging and Data Visualization and Dashboards

Adagios - Web based Nagios configuration interface -- HTML
Alerta - Distributed and de-coupled, requires MongoDB -- Python
Bosun - Monitoring and alerting system written by Stack Exchange, based on Borgmon -- Golang
Cabot - Self-hosted, easily-deployable monitoring and alerts service - like a lightweight PagerDuty -- Python
check_mk - Extensions / plugins for Nagios -- C
check_mk Multisite - GUI for check_mk -- various lang
Daemon Tools - Service monitoring and management tools -- DJB
FastForward (ffwd) - Flexible system event and metric forwarding agent by Spotify -- Ruby gem
Icinga - Nagios fork, updated frequently -- various lang
Icinga2 - Complete re-write of Icinga by the same folks -- various lang
LibreNMS - GPL fork of Observium -- various lang
Monit - Includes tools to automatically take action when certain conditions are met (eg: restart a process when it dies) -- C
Monitorix - So lightweight that it can be used in mobile devices, aka Mikaku -- perl
Naemon - Modular Nagios fork -- various lang
Nagios - One of the most widely used OSS monitoring programs -- various lang
nagios-herald - Gives context to Nagios alerts, by Etsy -- Ruby
Nagios Exchange - Centralized repository of Nagios plugins, addons, extensions, etc -- collection
NetXMS - Monitoring for all types of devices across the entire data center (hosts + network devices) -- C
OpenNMS - Network monitoring, also supports configuration/asset management -- various lang
Open Monitoring Distribution (OMD) - Nagios bundled with the most popular plugins and tools -- various lang
pmacct - IP and network traffic accounting / monitoring -- C
PHP Server Monitor - Simple monitoring package that can use built-in public SMS gateways for notifications -- PHP
Pynag - Interface with Nagios via Python -- Python pip
Sensu - Open source monitoring framework, cloud-focused, dynamic, scalable - also does metrics collection -- Ruby
Sensu Plugins - Official community site for Sensu plugins -- various lang
Shinken - Nagios-compatible monitoring, supports high availability -- Python
Tattle - Self service alerting and dashboard frontend for Graphite and Ganglia -- PHP
Uptime - Remote monitoring application using Node.js, MongoDB, and Twitter Bootstrap -- JavaScript
Xymon - Fork of Big Brother -- C
Zabbix - Stores monitoring data in a DB, has agents for almost every OS, can be a virtual appliance -- various lang
Zenoss Core - Supports Nagios plug-in format, based on the Zope application server -- Python

Networking Tools

Hodge-podge of network tools - see also Security Tools and Network Performance Analysis Tools and Orchestration for parallel SSH tools

2ping - Simple bi-directional ping utility, helps determine where packet loss occurs -- Python
aria2 - CLI for downloading HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink -- C Windows OS X
ARIN WHOIS in JSON - Authoratative (official) info including CIDR and OriginAS, updated every 8h -- collection
arp-scan - Create and send ARP requests -- C
Awesome PCAP - Huge list of tools that work with PCAP captures -- collection
bbcp - Copies files using multiple TCP streams to greatly increase throughput -- C
bbFTP - Uses it's own transfer protocol, optimized for large file transfers -- C
BIRD Internet Routing Daemon (BIRD) - (Almost) fully functional IP routing daemon for Linux, supports tons of standard routing protocols -- C
BPF Tools - BSD Packet Filter (BPF) and pcap toolkit, by CloudFlare -- Python
CERT NetSA Security Suite - Network flow analysis tools -- various lang
Cyberduck - GUI FTP, SFTP, WebDAV, S3 & OpenStack Swift browser for Mac and Windows -- itsaduck
Data Plane Development Kit (DPDK) - Data plane libraries and framework for fast packet processing -- C
dsniff - Great for level 2 analysis or service spoofing -- C
ElastiFlow - Netflow collection and visualization using the ELK stack -- various lang
ExaBGP - The BGP swiss army knife of networking -- Python pip
Fast Data Transfer (FDT) - For writing at disk speed over WANs -- Java
FBOSS (FaceBook Open Switching System) - FB's software stack for managing and controlling their internal switches -- various lang
FRRouting - Replacement for / fork of Quagga with more features -- C
ftptop - Monitor FTP connections in real time -- built-in
Gas Mask - Simple hosts file manager for Mac OS X, switch between host files easily -- Objective C
kcptun - Secure and fast tunnel based on KCP -- Golang
ipcalc - CLI tool to calculate subnets, netmasks, IP ranges, broadcast addresses, and more -- built-in
iptstate - A top-like display of IP Tables state table entries -- built-in
GridFTP - Supports parallel streams, optimized for WANs, part of the Globus Toolkit -- C
hosts - Consolidates several reputable hosts files and merges them into a unified hosts file with duplicates removed (ads, malware, gambling, porn, etc) -- collection
hping3 - Create custom TCP/IP packets, very flexible -- built-in
lftp - Supports many protocols (FTPS, HTTPS, SFTP), scheduling, bandwidth throttling, scripting, and more - feature-rich -- C C++
lldpd - Daemon that can talk LLDP aka the open version of Cisco Discovery Protocol (CDP), handy for network + host mapping -- C
Manito Networks Flow Analyzer - ELK stack netflow analyzer -- Python
moloch - Large scale IPv4 full PCAP capturing, indexing and database system -- JavaScript
mrsync (multicast remote sync) - Transfers from a master to many remote machines using Unix multicast sockets -- C
mTCP - High-performance user-level TCP stack for multicore systems -- C
Multipath TCP Checker - Multipath TCP client tester -- in-browser
My Looking Glass (myLG) - All-in-one CLI network diagnostic tool -- Golang
NAPALM (Network Automation and Programmability Abstraction Layer with Multivendor support) -- Network automation and programmability abstraction layer, for both setting config and config validation -- Python pip
ncat - Improved netcat, written by the Nmap team -- C
Netconf - Web-based GUI for configuring API-less Cisco devices -- Python
netsniff-ng - High performance, zero-copy networking sniffer -- C
netstack - Multi-platform userspace network stack written in Go -- Golang
NfSen - GUI for and visualization nfdump -- perl
ngrep - Network grep -- C built-in
nping - Create custom network packets -- C
OpenBGPD - Free implementation of BGP v4 -- C
OpenBMP - BGP Monitoring Protocol collector with real-time monitoring, looking glass, analytics, etc -- various lang
OpenWRT - Full Linux distro for consumer-grade routers, allows for tons of non-vendor customization -- various lang
PFQ - Framework that allows efficient packets capture/transmission, in-kernel functional processing, and packets steering across sockets/end-points -- C
PowerAdmin - Simple Web UI for PowerDNS -- PHP
Quagga - Routing software suite, supports most routing protocols -- C
scapy - Interactive packet manipulation for Python -- Python pip
snabb - Worth seeing -- various lang
socat - netcat on steroids, supports serial devices -- C
sslh - Protocol multiplexer, let multiple daemons listen on a single port -- C
tcpflow - TCP demultiplexer, each flow is stored in it's own file -- C++
tcpreplay - Capture, edit, and replay network traffic -- C
tracepath - Traceroute that doesn't require root -- C
Trigger - Network automation toolkit written in Python, created by AOL -- Python
UDR - UDT wrapper for rsync that improves throughput of large data transfers over long distances -- C++
vFlow - High-performance, scalable and reliable enterprise netflow collector with Kafka integration, by Verizon -- Golang
WireShark - The classic network analyzer -- C
WireShark Tools - Superb list of network tools from the WireShark wiki -- collection
Zenmap - Official GUI for Nmap -- C Windows OS X

Network Performance Analysis Tools

Load generation, benchmarking, profiling, and latency simulation tools for TCP/IP networks - see also Web and HTTP Performance Analysis Tools and Performance Analysis Tools

ARGUS (Audit Record Generation and Utilization System) - Generates network activity reports -- C
Augmented Traffic Control (ATC) - A tool to simulate network conditions, by Facebook -- Python
bmon - Console based network monitor -- C
clumsy - Simulate poor network conditions on Windows -- C Windows
Comcast - Simulate crappy network connections -- Golang OS X
dummynet - Simulates/enforces queue and bandwidth limitations, delays, packet losses, and multipath effects -- C Windows
ESnet Fasterdata Knowledge Base - Provides proven, operationally sound methods for troubleshooting and solving performance issues -- collection hpcwisdom
EtherApe - Graphical network monitor, pretty output -- various lang
Flent - Python wrapper to run mutliple netperf/iperf3/ping in parallel, formerly netperf-wrapper -- Python
Flowgrind - Distributed TCP traffic generator -- C
iftop - top for network interfaces -- C
intrace - Enumerate IP hops using existing TCP connections -- C
iperf3 - Supports tuning of various parameters related to timing, protocols, and buffers -- C
iptraf-ng - Updated fork of iptraf -- C
jnettop - Terminal / ncurses traffic visualizer -- C
mtr (my traceroute) - Combines ping and traceroute into a single program -- C
Muxy - Muck with your system and application context layers 4-7 -- Golang OS X
namebench - Hunts down the fastest DNS servers for your computer to use -- Python Windows OS X
netatop - Kernel module for atop to watch and report on network packets -- C
netem - Network emulator for testing variable delay, loss, duplication and re-ordering -- C
NetHogs - Displays per-process bandwidth usage -- C C++
Network Link Conditioner - Simulate bandwidth, latency, and packet loss, by Apple -- closed source OS X
nfdump - Captures network flows including sFlow, NetFlow, NetFlow v9, ipfix, etc -- perl
nicstat - vmstat for network interfaces -- C
nload - Console application that monitors network traffic and bandwidth usage in real time, neat ASCII graphs -- C++
ntopng / ntop-ng - New version of the popular ntop tool -- C
netperf - Network load generator, by HP -- C
Outages.org Mailing List - Report and discuss major outages, network status updates, etc -- mailing list
Paris Traceroute - Shows proper network topology when load balancers and load-balanced routers are used -- C
SmokePing - Network latency visualizer, written by the MRTG and RRDtool guy -- perl
ss - Socket statistics, a modern netstat -- built-in
Stanford Linear Accelerator Center - Network Monitoring Tools - MASSIVE list of network monitoring tools -- collection
tc - Built-in Linux kernel traffic control -- built-in
TCP Throughput Calculator - See name -- in-browser
tcpdive - TCP performance analysis tool, implemented as SystemTap scripts -- C
tcptrack - Console based connection tracker -- built-in
TCPWatch - TCP monitoring and logging tool -- Python pip
Tracebox - Detect middleboxes (NAT, transparent proxies, etc) in a network path -- C++
trickle - Userspace bandwidth shaper -- built-in
vnStat - Console based traffic monitor, supports statistic collecting -- C
Yconalyzer - Monitor and analyze TCP connections -- C++

Orchestration

OS and VM level orchestration as well as parallel SSH tools - see also Terminal Tools and SSH Clients for SSH clients and SSH Tools for misc SSH tools and Provisioning Tools

Ansible - CM and orchestration, also can do provisioning -- Python
Archipel - Use XMPP push notifications to manage, supervise, and orchestrate VMs -- Objective-J
Batou - Define and perform automated service deployments -- Python pip
Capistrano - Use Ruby to run scripts/commands and push software via SSH, uses a Rake DSL -- Ruby gem
ClusterSHISH - Cluster SSH for Windows, works with PuTTY and OpenSSH for Windows -- closed source Windows
ClusterSSH - Make a change on many servers at the same time -- perl
csshX - Cluster SSH for OS X -- C
Fabric - Uses paramiko to implement a higher-level API for performing commands over SSH, particularly for deployment sysadmin tasks -- Python pip
KeyBox - Web-based SSH console that executes commands on multiple shells simultaneously and supports terminal sharing -- Java
KeyBox-OpenShift - KeyBox for OpenShift gears -- Java
ManageIQ - Upstream OSS project for Red Hat's CloudForms -- Ruby
Mass Parallel SSH (mpssh) - Simple parallel SSH -- C
mcollective (Marionette Collective) - Orchestration, can be used independently of Puppet -- Ruby gem
mussh - MUltihost SSH -- C built-in
OpenLMI (Open Linux Management Infrastructure) - Manage, monitor, and configure servers via API calls (instead of SSH), included in RHEL 7 -- various lang
orgalorg - Next generation parallel SSH tool because most other major ones are no longer maintined -- Golang
parallel - Execute jobs in parallel using one or more computers -- built-in
parallel-ssh (pssh) - Parallel version of OpenSSH tools - comes with prsync, pscp, pnuke, and pslurp too -- Python built-in
Parallel Distributed Shell (pdsh) - Kick off many SSH sessions in parallel -- C
paramiko - SSH2 protocol library for Python, provides both client and server -- Python pip
PyDSH - Python Distributed Shell, parallel SSH -- Python
RadSSH - Paramiko-based parallel SSH -- Python pip
Rex - Framework for server orchestration and to simplify system administration -- perl
Rubber - Capistrano/rails plugin that makes it easy to deploy/manage/scale to various service providers -- Ruby
Rundeck - Job scheduler and runbook automation, enable self-service access to existing scripts and tools -- Groovy
Salt / Saltstack - Orchestration, server provisioning, and configuration management -- Python
Spacewalk - Remote commands/orchestration, patch management, and more - the upstream for Red Hat Satellite 5.x and earlier -- various lang
Teleport - Front-end for teams, includes session capture and replay, auditing, 2FA, session sharing, and more -- Golang
tmux-cssh - Cluster SSH via tmux -- shell
xCAT (Extreme Cloud Administration Toolkit) - Complete all in one management solution (provisioning, orchestration, management, etc) supports almost every UNIX and next generation platform, by IBM -- legit

Package Patch and Repository Tools

Repos, RPM/APT packages, packaging guidelines, patching, and patch management - see also Provisioning Tools

apt-dater - Simple ncurses frontend for package management via SSH, also supports yum -- C
aptly - Swiss army knife for Debian repository management, has the ability to take snapshots for easy rollback -- C
AutoPkg - Packaging and distribution for OS X, great for managing many laptops -- Python OS X
CentOS Errata for Spacewalk (CEFS) - Import errata information from CentOS-announce into Spacewalk -- useit
CentOS Repositories - Large list of both official and unofficial CentOS software repositories -- collection
CentOS Software Collections (SCL) - Use multiple versions of software on a system without disturbing the system default version -- C
Copr - Automatic build system providing a package repository as its output, by Fedora -- C
cowbuilder - Package builder that uses copy-on-write (COW) to speed up the build process -- C
DNF - Package management system that will replace Yum in upcoming Fedora/RHEL/CentOS releases -- article
ELRepo - Repo that focuses on hardware related packages, supports RHEL and CentOS -- repo
Extra Packages for Enterprise Linux (EPEL) - Supports CentOS, RHEL, Scientific Linux, and Oracle Linux -- repo
Extra Packaging Guidelines and Policies for EPEL - Packaging guidelines, great even if not creating EPEL stuff -- readit
Fedora Packaging Guidelines - Excellent information that can be applied to CentOS & RHEL -- readit
Flatpak - Standalone, sandboxed apps so you can avoid package management all together -- C
fpm (Fucking Package Management) - Build packages for multiple platforms (deb, rpm, etc) with great ease and sanity -- Ruby gem
fpm-cookery - Tool for building software packages with FPM -- Ruby gem
Homebrew (aka brew) - Tons of packages for Mac -- Ruby OS X
Koji - Software that builds packages for Fedora, can be used for other stuff too, uses mock -- C
Mock - Build packages in a simple chroot so you don't blow up your system -- C
mrepo - RPM repository management tool supporting ftp/http/sftp/rsync/rhn/you, formerly Yam -- Python
Munki - Managed software installation for OS X, great for managing laptops -- Python OS X
OStree - Tool for managing bootable, immutable, versioned filesystem trees (not really a package manager but...) -- thefuture C
pkgr - Made deb or RPM packages out of any Ruby, NodeJS, or Go app -- Ruby
Pulp - Next generation repository management, a component of Red Hat Satellite 6 -- Python
Red Hat Software Collections (SCL) - Use multiple versions of software on a system without disturbing the system default version -- repo
reposync - Synchronize yum repositories to a local directory -- built-in
rpm-ostree - Hybrid image/package system with atomic upgrades and package layering -- C thefuture
RPM Fusion - Provides software that the Fedora Project or Red Hat doesn't ship -- repo
schroot - Allow non-root users to create chroot environments, great for package testing -- built-in
Spacewalk - Patch management, remote commands, and more - the upstream for Red Hat Satellite -- various lang
Tito - Tool for managing RPM based projects using git for their source code repository -- Python
yum-presto - yum plugin that provides support for downloading package deltas -- article
yum-security - Plugin to only install security updates -- built-in

Performance Analysis Tools

Non-specific and all-in-one performance monitoring tools - see also web, network, storage, and RDBMS and Tracing and Profiling

atop - Supports both real-time and historical performance monitoring -- C
bwm-ng - Small and simple console-based live network and disk I/O bandwidth monitor for a wide variety of UNIXes and Windows -- C
Conky - Lightweight system monitor for X windows -- C++
dstat - Versatile replacement for vmstat, iostat, netstat and ifstat -- Python
Glances - Real-time performance monitoring, written in curses and Python -- Python
hazelnut - Python lib to parse /proc/meminfo -- Python pip
htop - top replacement, has a few additional features -- C
Linux Performance Observability Tools - Awesome graphic that shows you which tool to use, by Brendan Gregg -- the man
Linux Performance - Centralized page for all of Brendan Gregg's Linux performance material (slides videos pages etc) -- see above
mem_logger.sh - Monitor a processes' memory usage over time -- shell
Munin - Historical performance monitoring to help determine when you server became "slow" -- perl
NetData - Real time performance visualization and dashboards -- C
nmon - Provides both real-time and historical performance metrics -- C
NumaTOP - top for NUMA systems, shows hotspots, call chains, etc -- C
PerfKit Benchmarker - Open effort to define a canonical set of benchmarks to measure and compare cloud offerings (disk, network, CPU, etc) -- various lang
Performance Co-Pilot (PCP) - System performance and analysis framework, included in RHEL 7 -- C
Phoronix Test Suite - Benchmarking and profiling suite, very feature-rich and versatile -- PHP
pidstat - vmstat type output for CPU, disk I/O, page faults, and more on a per-process basis -- built-in
pmap - Shell scripts for tracking memory usage using "pmap" -- shell
PowerTOP - Real-time power consumption on a per-process & per-thread basis, by Intel -- C++
ps_mem - Accurately reports core memory usage for a process -- Python
ptop - top/ntop-like task monitor written in Python -- Python pip
recap - Collects info from various standard utilities (free, sar, vmstat, etc) at specified intervals, by Rackspace -- various lang
saidar - ncurses based program for viewing system statistics -- built-in
slabtop - Tutorial on how to use slabtop, useful when you have no idea on how your RAM is being used -- article
smem - Reports memory usage based on proportional set size (PSS) instead of the usual resident set size (RSS) -- C
sysdig - Linux system exploration and troubleshooting tool with first class support for containers -- C++
USE Method - Brendan Gregg's rosetta stone for performance analysis and tuning -- article

Provisioning Tools

OS provisioning, image creation, installation, bootstrapping, and lifecycle management - see also Package Patch and Repository Tools and Containers and Distributed Systems Tools and Live CD Tools

Bento - Baseboxes provided by Chef, for Packer + Vagrant -- various lang
bootrino - Provision run-in-RAM / diskless OSes (Linux, etc) in various clouds -- various lang
Box-Cutter - Hashicorp's community repo for Packer & Vagrant templates -- Ruby
Clonezilla - Disk image/cloning tool, supports most file system types -- perl shell
cloud-init - Configures settings the first time a system spins up (SSH keys, hostname, variables, etc), note NoCloud -- C
Cobbler - Provisioning system used in Red Hat's Satellite -- Python
Crowbar - Multi-purpose provisioning tool, created by Dell -- Ruby
Fog - Computer / OS cloning tool, also has remote client management capabilities -- C++
Foreman - Provisioning and life cycle management -- Ruby Windows OS X
iPXE - GPL'ed version of PXE, official replacement for gPXE -- C
Katello - Candlepin + Pulp + Foreman, the core of Red Hat Satellite 6 -- various lang
Kickstart - The classic Red Hat tool -- various lang
Metal as a Service (MaaS) - Ubuntu provisioning system -- various lang
netboot.xyz - Simple iPXE menu and installer -- shell
Overcast - VM orchestration and provisioning for DigitalOcean, Linode and Amazon, or locally using Vagrant + Virtualbox -- various lang
Packer - Automates VM creation for multiple platforms (VMware, AWS, etc) -- Golang
Terraform - Infrastructure provisioning using existing tools, supports many providers (AWS, Azure, DO, OpenStack, etc) -- Golang Hashicorp
Terragrunt - Tools for keeping your Terraform configurations DRY, working with multiple Terraform modules, and managing remote state -- Golang
Vagrant - Quickly spin up environments for local testing and development -- Ruby
Vagrant Plugins - A list of Vagrant plugins on the official Hashicorp wiki -- collection
Vagrant Manager - GUI to manage Vagrant boxes -- Windows OS X
vagrant-cachier - Cache BLOB downloads to reduce network usage -- Ruby
vagrant-host-shell - Simple plugin to run commands on the VM when it boots (think cloud-init) -- Ruby
vagrant-hostsupdater - Plugin to add your own /etc/hosts to the VM -- Ruby
vagrant-lxc - Provision to Linux containers instead of the usual VirtualBox -- Ruby
vagrant-triggers - Run arbitrary scripts on the guest before and/or after Vagrant commands -- Ruby
vagrant-vbguest - Auto-install the latest VirtualBox tools at boot time (if necessary) -- Ruby
veewee - Easily (and repeatedly) build custom Vagrant base boxes, KVMs, and VM images -- Ruby
veewee-to-packer - translate veewee templates to Packer templates -- Ruby gem
Salt / Saltstack - Orchestration, server provisioning, and configuration management -- Python

Python Tools and Resources

Python stuff of note

Awesome Python - Very large list of Python resources -- collection
bpython - Killer interface for the Python interpreter -- Python
Common Python Mistakes - Link and discussion on HN -- article
Easy-Python - Collection of Python resources that "you didn't know you would need" -- collection
Faker - Generate fake data easily -- Python pip
Google Python Style Guide - Google's Python style guide -- article
IPython - Interactive Python shell and the kernel for Jupyter -- Python
Jinja2 - Templating language for Python -- Python pip
Jupyter - The language-agnostic parts of IPython -- Python
PyPI (Python Package Index) - Software repo for Python packages, like Ruby gems or a RPM repo -- collection
Python Reference - A collection of useful scripts, tutorials, and other Python-related things -- collection
PyPy - Python alternative with advance features (JIT compiles, sandboxing, etc) -- Python
python-prompt-toolkit - Library for building interactive command lines -- Python pip
Requests - The best HTTP library -- Python pip
sh - Library that allows you to call any program (shell command) as if it were a function -- Python pip
virtualenv - Tool to create isolated Python environments -- Python pip
virtualenvwrapper - Extensions to virtualenv -- Python pip
xlwings - Replace your Excel VBA code with Python -- Python pip

Python Programming Tutorials

Tutorials, exercises, and challenges for learning Python. I have no idea how good/bad these are

500 Lines - Many full Python programs written in 500 lines or less, great for beginners
Codecademy - Codecademy's online Python course
CodingBat - Practice problems
Coursera - Online Python courses at various institutions
Dive Into Python 3 - Free ebook
edX - Python courses at edX
Google Python Class - By the GOOG
importpython's Python Book List - Includes both free and pay, ebooks and physical
Intermediate Python - Free ebook
Invent with Python - Series of free ebooks, includes Automate the Boring Stuff with Python, recommended books
Learn Python, Break Python - Free ebook
MIT Open Courseware - Introduction to Computer Science and Programming - Focuses on Python
MIT Open Courseware - A Gentle Introduction to Programming Using Python - Final project is a Tetris game in Python
MIT Open Courseware - Objects in Python - Python tuples, lists, and dictionaries, as well as the concept of mutability and how to avoid problems relating to it.
MIT Open Courseware - Python Tutorial - Python tutorial for people familiar with basic programming concepts
New Coder - Python exercises
Online Python Tutor - 100% in-browser
Programming Praxis - Programming exercises, many posted solutions are in Python
Python Challenge - A riddle in Python
Python for Infomatcis - Free ebook
Python for You and Me - The 2.x version is linked on the main page
Python Practice Projects - Several practice exercises
Python 2.x Tutorial - For 2.x, part of the official documentation
Python 3.x Tutorial - From the official documentation
Quiz and Learn Python - Designed for mobile devices
r/dailyprogrammer - Programming exercises, includes Python
r/learnpython - Subreddit for beginners, be sure to check the wiki too
Supporting Python 3 - Free ebook that focuses on porting to Python 3.x
Think Python: How to Think Like a Computer Scientist - Awesome free ebook
Tutorials Point's Python Tutorial - Another one!

RDBMS and SQL Tools

Tools for interacting with and related to the major DBs and SQL

Adminer - GUI for database management in a single PHP, formerally phpMyAdmin -- PHP
CockroachDB - Open source version of Google's Spanner storage system -- thefuture Golang
DB Browser for SQLite - GUI database browser for SQLite instances -- C++
Flyway - Version control for DB schemas, supports most DBs -- Java
gh-ost - Online schema migrations for MySQL, by GitHub -- Golang
HeidiSQL - GUI SQL DB browser and editor -- Windows OS X
Large Hardon Migrator (LHM) - Live, online MySQL migrations -- Ruby
Liquibase - Tracking, managing, and applying database schema changes, SVN for DBs -- Java
MaxScale - General purpose DB query proxy, router, and load balancer by MariaDB -- C
mycli - CLI for MySQL and derivates with auto-completion and syntax highlighting -- Python
mydumper (MySQL Data Dumper) - Much better than mysqldump, works in parallel -- perl
MyRocks - RocksDB with a MySQL front-end / interface -- C++
MySQL sys schema - Collection of views, functions and procedures to help MySQL administrators get insight into MySQL usage -- SQL
MySQL Utilities - Official collection of MySQL tools -- various lang Python
MySQL Workbench - The official MySQL GUI for admins, devs, DBAs, and architects -- various lang
Oracle TPT Scripts - Tab completion for Oracle -- SQL
orchestrator - MySQL replication topology management and visualization tool, GUI -- Golang
Peloton - Self tuning, self optimizing DB -- C++
Percona Toolkit for MySQL - Percona's special toolkit -- various lang
pgcli - Postgres CLI with autocomplete and syntax highlighting -- Python
pgloader - Fast data loader for PostgreSQL -- Lisp
pgweb - Web-based PostgreSQL DB browser -- Golang
pg_repack - Remove bloat from tables and indexes without using an exclusive lock -- C
Phinx - Database migrations in SQL or PHP -- PHP
Postgres-XL - Scale-out version of PostgresSQL -- C
Postgres.app - All-in-one version of Postgres for local testing on a laptop -- C
PostgREST - Create a REST API for any Postgres DB -- Haskell
PostgreSQL GUI Tools - A huge list on the official wiki -- collection
Presto - Distributed SQL query engine for big data, by Facebook -- Java
rdbms-subsetter - Generate a random sample of rows from a relational database that preserves referential integrity, great for using production data for testing/dev -- Python
rlwrap - Add history and tab completion to SQLplus -- C
SchemaSpy - Analyze the metadata of a schema and visualize it in HTML -- Java
Sequel Pro - MySQL management GUI for Mac -- OS X
shift - Schema migrations for MySQL, by Square -- Ruby
SQLite - Self-contained, serverless, zero-configuration, transactional SQL database engine, great for testing -- C
sqlmap - Detect and exploit SQL injection flaws, pen testing tool -- Python
SQL Fiddle - Write and test SQL -- in-browser
wal-e - Simple continuous archiving for PostgreSQL -- Python
WebScaleSQL - Huge scale MySQL with contributions from Facebook, Google, LinkedIn, and Twitter -- C C++
WWW SQL Designer - Designing RDBMS schemas features saving, exporting to XML, and SQL script creation, free SaaS version here -- JavaScript

RDBMS Performance Analysis Tools

Load generation, benchmarking, telemetry, and profiling for various RDBMS platforms - see also Storage Performance Analysis Tools and Performance Analysis Tools and Tracing and Profiling and Network Performance Analysis Tools and Metrics and Time Series Data

Anemometer - MySQL slow query log monitor and analyzer, by Box -- PHP JavaScript
HammerDB - Load testing and benchmark tool, supports most DBs -- Tcl
innotop - "top" for MySQL -- NOTE: beware of exposing your password -- perl
MySQLtuner-perl - Analyzes a MySQL installation and provides suggestions to increase performance -- perl
MySQL Performance Analyzer - Open sourced by Yahoo -- Java
MySQL Performance Tuning Cheat Sheet - Superb Reddit post on performance evaluation and tuning -- article
MySQL Performance Tuning Checklist - No bullshit list in about 15 bullet points -- collection
mytop - Another "top" for MySQL -- perl
Open PostgreSQL Monitoring (OPM) - Includes a web console, nice GUI -- JavaScript
Percona Monitoring Plugins - Some of the best mySQL plugins -- various lang
Percona Toolkit for MySQL - Percona's internal tools -- various lang
pg_activity - htop for PostgreSQL -- Python
pg_view - PostgreSQL monitoring, supports ncurses, console, and JSON output -- Python pip
pgBadger - PostgreSQL log analyzer -- perl
PgHero - A performance dashboard for Postgres - health checks, suggested indexes, and more -- JavaScript
PGObserver - Killer PostgreSQL monitor, includes dashboard -- Python
Silly Little Oracle Benchmark 2 (SLOB2) - Stresses and benchmarks Oracle DBs, works at the RDBMS layer -- various lang
Swingbench - Oracle load generator -- closed source
SysBench - Evaluates OS parameters that are important for DBs, does not require a DB to be installed -- C
Tsung - Distributed stress tester, also supports stress testing DBs -- Erlang
Use the Index, Luke - SQL indexing and tuning for developers -- article

Regular Expressions

regex checkers, creators, evaluators, debuggers, and tutorials - see also Shell Scripting and Tools and Software Development Tools

Debuggex - Online regex debugger -- in-browser
perlretut - perl-focused but very useful for all regex -- article
Refiddle - Online, supports JavaScript, Ruby, and .NET only -- in-browser
regex101 - Online regex tester and debugger, supports multiple languages -- in-browser
RegexOne - Learn regular expressions with simple, interactive examples -- tutorial
regexper - Regex visualizer using railroad diagrams, great for debugging -- in-browser
RegExr - Another online regex tool that includes cheat sheets, examples, and community-contributed expressions -- collection
RegularExpressions.info - THE BEST regex site -- collection
Regular Expressions - A Gentle User Guide and Tutorial - The easy way -- tutorial
RexV.2 - Online Regex evaluator, supports multiple languages -- in-browser
Rubular - Online Ruby-only regex evaluator -- in-browser
txt2re - Regex generator, recommended -- in-browser
txt2regex - Converts human sentences to regex, written in bash -- shell

Ruby Tools and Resources

Ruby toolbox full of junk

Awesome Ruby - A collection of awesome Ruby libraries, tools, frameworks and software -- collection
Bundler - Manage Gem dependencies using simple config files -- Ruby gem
did_you_mean - Suggestions for typos in Ruby code -- Ruby
fog - Library for communicating with clouds -- Ruby gem
Omniref - A better search site for Ruby documentation -- collection
Pry - IRB alternative, very feature-rich, great for debugging -- Ruby gem
Rake - Make / Makefile-like build utility -- Ruby gem
rbenv - Alternative to RVM -- shell
replicate - Dump and load relational objects between Ruby environments (eg: prod and dev) -- Ruby gem
RSpec - Behavior-driven development (BDD) testing framework -- Ruby
RuboCop - Static code analyzer that enforces guidelines -- Ruby gem
Ruby Gems - The Ruby package manager, gems are essentially libraries -- Ruby gems
Ruby Toolbox - Trillions of Ruby projects, categorized -- collection
RVM (Ruby Version Manager) - Install, manage, and work with multiple Ruby environments -- Ruby

Ruby Programming Tutorials

Tutorials, exercises, and challenges for learning Ruby. I have no idea how good/bad these are

Basic Ruby - Videos and exercises
Codecademy - Ruby course at Codecademy
Coderbyte - Programming challenges
Codewars - More challenges!
Coursera - Online Ruby courses at various institutions
edX - Ruby courses at edX
exercism.io - Challenges with peer review!
Introduction to Programming with Ruby - By Tealeaf Academy & Launch School
Learn Ruby the Hard Way - Have fun with this
r/dailyprogrammer - Programming exercises, includes Ruby
r/learnruby - Subreddit for beginners
Rubeque - Super easy to hard level challenges
Ruby Koans - The most highly recommended tutorial
Ruby Monk - Free, interactive tutorials to help you discover Ruby idioms in your browser
Ruby Quiz - Weekly programming challenge
Ruby Warrior - Coding challenges WARNING sound, but you can turn it off
Treehouse Ruby Courses - Recommended
Try Ruby - Interactive tutorial in your web browser
Tutorials Point - Interactive online course

Secrets Management

Password, private key, and API key storage and management tools - see also Security Tools and SSL Tools and Two Factor Authentication and VPNs and Tunnels

blackbox - Safely store secrets in Git, by Stack Exchange -- shell
Diceware - Neat IRL passphrase generator -- doitirl
credstash - Secrets management using AWS KMS -- Python pip
GPG (GNU Privacy Guard) - The original! Store em in text files and encrypt -- C pro
GRC Password Generator - Generates 63 bit passwords -- in-browser
Kee - Auto-fill website logins using KeePass as a source, like LastPass -- C# Firefox
Keybase - Upload your public key and find other people's public key via their social media user name(s) -- in-browser
KeePass - Lightweight, easy to use, GUI password manager, runs on most platforms -- C# Windows
Keepass2Android - Compatible with KeePass 2.x -- Android
KeePassDroid - Open source version of KeePass 1.x for Android -- Android
KeePassXC - Supports YubiKey and TOTP, forked becasue KeePassX is no longer being updated -- C++
KeeWeb - Cross-platform password manager compatible with KeePass -- JavaScript
Keywhiz - A system for distributing and managing secrets (API keys, certificates, etc), by Square -- Java
kpcli - Command line interface / CLI for KeePass -- perl
lastpass-cli - CLI for LastPass -- C
MacPass - A free, open-source, KeePass-compatible password manager for macOS -- Objective-C
msktutil - Keytab client for a Microsoft Active Directory environment -- built-in
One-Time Secret - Create links that self-destruct after a single viewing, great for sharing passwords -- Ruby
pass (passwordstore) - Uses GPG at it's core, supports tracking password changes in git -- shell
passff - Addon for interacting with the a pass aka passwordstore repository -- Firefox
Password Pusher - Links to passwords expire after a certain number of views and/or time has passed, RoR app -- Ruby
Password Safe - Designed by Bruce Schneier himself -- bam
pwd.sh - Script to manage passwords in an encrypted file using GPG -- shell
pwgen - Password generated, included in most Linux distros -- built-in
Secrets OPerationS (SOPS) - Secrets management, by Mozilla -- Python
Sneaker - Store secrets on S3 using Amazon KMS -- Golang
TeamPass - Collaborative password management using the LAMP stack -- PHP
Vault - Tool for storing secrets (API keys, passwords, certs, etc) by Hashicorp -- Golang
vault-ui - React UI for Hashicorp Vault -- JavaScript
xca - OSS all in one PKI -- C++
zxcvbn - Password strength estimator, written by Dropbox, operates in a browser window -- CoffeeScript in-browser

Security Tools

Misc security tools - see also Live CD Tools and Networking Tools and Secrets Management and SSL Tools and Two Factor Authentication and VPNs and Tunnels and Logging

afl-fuzz (American Fuzzy Lop) - One of the best fuzzers -- C
AIDE (Advanced Intrusion Detection Environment) - File integrity checker, alternative to Tripwire -- various lang
Angry IP Scanner - GUI network scanner, supports plugins, -- Java Windows OS X
Armitage - GUI for Metasploit -- Java
ATA Secure Erase - Send a signal to an ATA drive to perform a hardware-based erase, the ONLY way to wipe a SSD properly -- article
Awesome Honeypots - Curated collection of honepots and honeypot resources -- collection
bro - Framework for network analysis and security monitoring -- C++
CALDERA - Automated adversary emulation system that performs post-compromise adversarial behavior within Windows Enterprise networks -- Python
chkrootkit - Rootkit checker, best used from a live CD -- C
CIS Linux Benchmarks - Linux OS hardening guides, superb! -- collection
ConfigServer Security and Firewall (CSF) - Stateful Packet Inspection (SPI) firewall, Login/Intrusion Detection and Security application for Linux servers -- various lang
cuckoo - Feed in malware URL, it fires up VM, and provides a report about the actions the malware took -- in-browser
dcfldd - Enhanced dd with security and forensics features -- C
Dradis CE (Community Edition) - Reporting framework for generating one-click reports (vuln scanning, pentest, etc) -- Ruby
Dshell - Network forensic analysis framework, written by the US Army -- Python
EncFS - Encrypted file system in user space via FUSE -- C++
fail2ban - Watches log files to ban IPs based on rules (too many failed logins, exploit attempts, brute force attacks, etc) -- Python
Forensics Acquisition of Websites (FAW) - Download and save social media sites, paid version has more features -- closed source Windows
Forensics Wiki - Digital forensics wiki, tons of tools and information -- wiki
FTimes - System baselining and evidence collection tool -- C
fwknop (FireWall KNock OPerator) - Single Packet Authorization (SPA), authoriation packet from you opens firewall rules so only you can get in -- various lang
Google Safe Browsing Site Status - Use Google for site/URL malware analysis -- in-browser
GRR Rapid Response - Live forensics for incident response via a Python agent, dump memory, isolate host, snoop syscalls etc -- Python
hashcat - World's fastest CPU password cracker / password recovery -- C
Hybrid Analysis - Dree malware analysis service that detects and analyzes unknown threats using a unique Hybrid Analysis -- in-browser
Information Security Cheat Sheets and Checklists - An assortment of IS checklists and cheat sheets -- collection
geoiplookup - Uses the GeoIP DB and library to determine which physical country an IP or host originates in, includes PAM library -- built-in
Hindsight - Internet history forensics for Google Chrome/Chromium -- Python
Jailkit - chroot toolkit -- C
Joe's Sandbox (Cloud Basic) - Deep automated malware analysis -- in-browser
Kali NetHunter Linux Root Toolkit (LRT) - Collection of bash scripts that setup and install Kali Linux NetHunter from a Linux/OSX environment onto a NetHunter supported device -- shell
Lynis - Auditing and hardening tool, supports most Unix-like operating systems -- shell
Metasploit - Classic exploit framework -- various lang
National Checklist Program - U.S. government repository of publicly available security checklists (or benchmarks) that provide detailed low level guidance on setting the security configuration of operating systems and applications -- collection
National Software Reference Library (NSRL) - Large collection of diskprints from various software and malware -- collection
Nikto2 - Web & app server vulnerability scanner -- perl
nmap - Classic port scanner -- various lang
nmap_vulners - Emumerate and list vulnerabilities during an nmap scan similar to Nessus -- collection
nmap Scripting Engine (NSE) - Tons of scripts for nmap -- various lang
oclHashcat - World's fastest CPU + GPU password cracker / recovery software -- C
OpenSCAP - NIST Certified SCAP 1.2 toolkit -- C
OpenVAS - Vulnerability scanner, forked from the now closed-source Nessus scanner -- C
Open Web Application Security Project (OWASP) - Focus on web application security -- organization
Oracle Database Attacking Tool (ODAT) - Open source penetration testing tool that tests the security of Oracle databases remotely -- Python
OS X Auditor - Forensics tool for Mac -- OS X JavaScript
OSSEC - Host based intrusion detection system (HIDS), supports most Unix-like OSes -- C Windows OS X
PALADIN - Easy to use Linux-based live CD for forensic analysis -- various lang
pfsense - The best firewall software, supports appliances and live CDs -- C
preeny - Some helpful preload libraries for pwning stuff -- C
Prey - Open source anti-theft software for almost all platforms -- shell Java mobile
ProcDOT - All in one visual malware analysis and visualization, by CERN -- closed source various lang
Qubes OS - A reasonably secure operating system -- various lang
ReconScan - Glue together pen testing workflows IFTTT style -- Python
Red Baron - Automate creating resilient, disposable, secure and agile infrastructure for red teams, Terraform based -- Golang
Red October - Go server for two-man rule style file encryption and decryption -- way cool
Regshot - Snapshot and compare the Windows Registry for before/after analysis -- C
Rootkit Hunter - Compares hashes of important files with known good hashes that are stored in online databases -- perl shell
Samhain - HIDS, file integrity checker, rootkit detection, log file monitoring, and more -- C
scrub - Supports many disk-wiping standards including military / government grade wipes -- built-in
Security Onion - Linux distro for IDS, NSM, and log management -- various lang
Security Technical Implementation Guide (STIG) - Guides to securing almost every application, by the US military -- collection
SELKS - Debian based based IDS/IPS with ELK stack, installable or live CD -- various lang
simplewall - Simple app to configure Windows Filtering Platform (WFP), VERY powerful -- Windows
Snort - The classic network intrusion prevention system (NIPS) -- C
SPARTA - GUI to simplify the scanning and enumeration phases -- Python
Spiderfoot - Automate the process of gathering intelligence about a given target -- Python
SubBrute - Subdomain enumeration tool for penetration testers -- Python
sudosh2 - Records all keystrokes and output and can play back the session as just like a VCR -- C
SWORD Dropbox -- $15 OpenWRT + Pi based DIY disposable pen-test tool -- various lang
symon-config - Sysmon configuration file template with default high-quality event tracing -- XML!!!! Windows
theZoo - These are real and they are smarter than you, do not fuck around -- collection
tink - Smiple, small, secure crypto library by Google -- C++
Tripwire - File integrity checker and monitor, replacement for the now closed-source Tripwire -- C
URLquery - Free service to scan a URL for web-based malware -- in-browser
urlscan.io - Similar to URLquery -- in-browser
usbkill - Kill switch that takes action when a USB device is connected -- Python
VeraCrypt - OSS successor to and fork of TrueCrypt, supports Linux, Windows, and Mac -- C C++
VirusTotal - Allows you to upload a file and have it scanned by tons of virus scanners -- in-browser
Tomb - zsh wrapper script for cryptsetup + gpg + LUKS volumes -- shell
VulnHub - ISOs and more for hands-on security practice -- collection
w3af - Web application attack and audit framework, OSS vun scanner -- Python
Yaptest - Glue together and automate pentesting using IFTTT type workflows -- various lang
Zed Attack Proxy (ZAP) - Pen testing too that focues on web applications -- Java
ZMap - Scanner designed for large address spaces -- in-browser
zzuf - Transparent application input fuzzer that works by intercepting file and network operations and changing random bits in the program's input -- C

Shell Scripting and Tools

Shell scripting tutorials, collections of note, Linux shells for Windows, and misc neat tools - see also Terminal Tools and SSH Clients and Orchestration for parallel SSH tools and Regular Expressions

Advanced Bash-Scripting Guide - By the Linux Documentation Project (LDP) -- tutorial
awk Tutorial - Easy to understand awk tutorial -- tutorial
Awesome dotfiles - All kinds of . files -- collection
autojump - Small database of directories that you visited in the past, used to quickly navigate complex directory structures -- Python
Awesome Shell - Massive collection of shell tools -- collection
Babun - Pre-configured Cygwin with many more features and a better design -- various lang
BashGuide - Targeted at beginners -- wiki
Bash Hackers Wiki - Human-readable bash documentation so you don't have to dig through the man page -- wiki
Bash Pitfalls - Common errors that bash programmers make -- wiki
bro pages - Simplifed man pages and examples -- collection
cheat - create and view interactive cheatsheets on the command-line -- Python
comm - Display lines that two files have in common (eg: the opposite of diff) -- built-in
CommandlineFu - Killer code snippets -- collection
CRUSH (Custom Reporting Utilities for SHell) - Killer toolset for working on delimited data, by Google -- C
Cygwin - GNU shell and tools for Windows -- C Windows
dotfiles by Paul Miller - Beautiful and flexible Mac terminal configuration files and utilities, ZSH-based -- shell OS X hawt
dotfiles - Unofficial guide to dotfiles on GitHub -- collection
Environment Modules - Dynamic modification of your shell environment using modules -- Tcl Windows
Explain Shell - Enter a command-line to see the help text that matches each argument -- in-browser
fu - CLI for CommandlineFu.com, allows for easy searches -- Python
fzf - Command line fuzzy finder, supports tmux/bash/zsh -- Golang
gt5 - A "du browser" in curses, handy for finding large files -- shell
icdiff - diff tool that highlights the differences -- Python OS X
moreutils - "Collection of the unix tools that nobody thought to write long ago when unix was young" -- neat
notify - Send a notification from your Linux system to an Android app on your phone, good for long running shell commands -- JavaScript Android
pigz - Parallel gzip for multi-processor/core systems -- C
pv - Shows the progress of data as it flows through a pipe -- built-in
ShellCheck - Checks shell scripts for common mistakes, essentially a linter -- in-browser
sysadmin-util - A collection of small but useful utilities -- perl
tldr - Simplified and community-driven man pages, cuts out a lot of cruft -- collection
Unix Toolbox - A collection of Unix/Linux/BSD commands and tasks for advanced users -- collection

Software Development Tools

Build systems, stubs/mocks, CI/CD, cheat sheets, and other - see also Git Tools and Collaboration Tools and Editors and Shell Scripting and Tools and Web and HTTP Tools and Tracing and Profiling and Web and HTTP Performance Analysis Tools

ack2 - grep-like tool designed to search source code -- perl
afl-unicorn - Fuzz any piece of binary that can be emulated by Unicorn Engine -- C
ag (aka The Silver Searcher) - Source code searching tool, a better grep -- C
Barkeep - Code review tool, kinda sorta like GitHub -- Ruby
Bazel - Google's build system -- Java
Bento - Links to tutorials based on subject (programming, sysadmin, protocols, standards, etc) -- collection
Buildbot - CI framework -- Python
cwrap - Wrappers for creating test scenarios and faking behavior/ stubbing, mostly network focused, by the Samba guys -- C
deployinator - Etsy's deployment framework -- Ruby gem
dev-setup - Automated setup scripts for laptop tools like Sublime Text, AWS, Spark, Android dev, and more -- collection
DevDocs - Documentation browser for almost every API -- collection
drone - CI platform built on Docker / containers, can also deploy to Kubernetes -- Golang
dropwizard - Simple library for building production-ready RESTful web services -- various lang
Fossil - Simple all-in-one SCM -- various lang
fswatch - Cross-platform for watching files and taking action when they change -- C++
GoCI - Go continuous delivery platform by ThoughtWorks -- Java
Guard - Flexible framework to take action on file system change event -- Ruby gem
Gulp - Built system / toolkit that helps you automate time-consuming tasks in your development workflow -- JavaScript
Jenkins - The most popular CI orchestration tool, supports a billion plugins -- various lang
jenkins-job-dsl (Jenkins Job DSL Plugin) - Groovy-based DSL for writing Jenkins jobs -- Groovy
Jenkins job-config-history Plugin - Tracks changes to system and job configurations -- Java
Jenkins ThinBackup - Jenkins plugin that backups configurations (not workspaces or archives) -- Java
JSON Server - Full fake REST API for quickly prototyping and mocking in 30 seconds -- JavaScript
LearnXinYMinutes - Super fast tutorials for almost every programming language -- collection
MockServer - Web server to remotely or locally mock HTTP/HTTPS and similar -- Java
mountebank - Stub downstream resources for testing, supports HTTP HTTPS SMTP TCP -- JavaScript Windows OS X
Ninja - Small build system with a focus on speed -- Python
OverAPI - Large collection of cheat sheets for almost anything -- collection
PatchELF - Simple utility for modifying existing ELF executables and libraries -- C
PEview - Easily and quickly view the structure and content of Windows EXE DDL LIB Portable Executable (PE) files -- closed source
PRoot - chroot, mount --bind, and binfmt_misc without privilege/setup -- C
Proxygen - Modern C++ HTTP library, by Facebook -- C++
REST-assured - Java DSL for testing of REST services -- Java
RocksDB - Library that provides an embeddable, persistent key-value store for fast storage - by Facebook -- C++
scrypt - More secure against hardware brute-force attacks than alternatives such as PBKDF2 or bcrypt -- C
Serverless by Design - In-browser or self-hosted GUI for making flow charts for serverless apps -- various lang
SonarQube - Platform and dashboard for managing code quality -- Ruby Java
Sonatype Nexus - Software / binary artifact storage -- Java
Spinnaker - Cloud-focused CI/CD system for immutable infrastructure, by Netflix -- Python
SymbolHound - Search engine that doesn't ignore special characters, great for programming questions -- try it
watchman - Watch files and take action when they change (eg: kick off the CI system), by Facebook -- C
WireMock - Flexible stubbing and mocking services -- Java

SSH Tools

Misc SSH stuff - see also Terminal Tools and SSH Clients for clients and Orchestration for parallel SSH tools and Shell Scripting and Tools

Advanced SSH Config - Enhances ssh_config file capabilities -- Python pip
autossh - Automatically restart SSH sessions that stop passing traffic -- C
Ballast (Balancing Load Across Systems) - Balance user load across SSH servers based on configured policies -- C
Corkscrew - Tunnel SSH through HTTP proxies -- C
Keychain - Manage SSH and GPG keys, acts as a frontend to ssh-agent, only enter passphrase once per reboot -- shell
Match - Creates a conditional block, great for controlling actions on a per-user and/or per-host basis in sshd_config -- built-in
Mosh (Mobile Shell) - Remote shell that supports roaming (client IP address changes) and intermittent connectivity, by MIT -- C++
rssh - Restricted shell for SSH, only allows scp, sftp, rdist, rsync, and cvs -- C
scponly - Shell that only allows incoming SCP, supports chroot -- C
Shuttle - A simple SSH shortcut menu for macOS -- Objective-C
ssh-chat Instead of a shell you get a chat prompt -- Golang
ssh-ldap-helper - Store public keys in LDAP -- built-in
SSHFS - Mount remote file systems using a SSH tunnel -- built-in
sshmuxd - SSH jumphost style proxy -- Golang
sshrc - Sources the ~/.sshrc on your local computer after logging in remotely -- shell
sshttp - Port multiplexer that hides a SSH daesmon behind HTTP, HTTPS, or SMTP on a single port -- C
SSH Guard - Think fail2ban for SSH -- C
SSH Power Tool (sshpt) - Execute commands and upload files to many servers simultaneously via SSH without using pre-shared keys -- Python pip
storm - CLI and GUI tool to manage your SSH connections (add, delete, list, search) -- OS X

SSL Tools

SSL, TLS, CAs, and similar tools for interacting with HTTPS and SSL certificates - see also Web and HTTP Tools and Security Tools

BadSSL.com - Test various clients (browsers, etc) against bad SSL configs -- in-browser
BoringSSL - Google's fork of OpenSSL, does not guarantee API and ABI compatibility -- C
cfssl - PKI/TLS swiss army knife, has CLI and a HTTP API server for signing, verifying, and bundling TLS certificates -- Golang
cipherscan - Find out which SSL ciphersuites are supported by a target -- Python
Dogtag Certificate System - PKI component of FreeIPA, by Fedora -- C
HSTS (HTTP Strict Transport Secuirity) - Forces browsers to interact with a site by only using HTTPS -- article
Lemur - Broker between CAs and environments providing a central portal for developers to issue TLS certificates with 'sane' defaults -- Python
Let's Encrypt - Free SSL certs from a real CA -- in-browser
LibreSSL - OpenBSD's fork of OpenSSL, Linux compatible -- C
Mozilla Server Side TLS - Mozilla's extensive server side TLS configuration guide -- wiki
Mozilla SSL Configuration Generator - Generate SSL configs for Apache, Nginx, ELB, HAproxy and more -- in-browser
nogotofail - Spot and fix weak TLS/SSL connections and sensitive cleartext traffic, by Google -- Python
Qualys SSL Server Test - Evaluates and provides recommendations for the SSL settings of any web site -- in-browser
s2n - Amazon's implementation of the TLS/SSL protocols in C99 (simple, small, fast, secure) -- C
Server Name Indication (SNI) - Think vhosts for SSL -- article
sslconfig - CloudFlare's Internet facing SSL cipher configuration, patches for Nginx and OpenSSL -- C
SSLsplit - Transparent and scalable SSL/TLS interception -- C
sslyze - Fast and full-featured SSL scanner, written in Python -- Python OS X
SSL Decoder - Decodes a SSL connection and displays certificate information, CLI -- PHP
SSL Decoder - Same as above but web based -- in-browser
stunnel - Create simple TLS tunnels for existing services (eg: telnet, nc, etc) -- C

Storage Tools

The storage junk drawer - see also Backups and Cloud File Sync and Sharing and Live CD Tools

BeeGFS - Parallel cluster file system, worth examining -- C++
CrystalDiskInfo - S.M.A.R.T. GUI tool for Windows -- closed source Windows
FlashCache - General purpose, write-back block cache -- C
fs-cache - Modern NFS client-side caching -- built-in
Linux-IO Target (LIO) - Create and share iSCSI, Fibre Channel, FC over Ethernet, and other storage targets from Linux VMs -- built-in
Linux Journal - Linux Swap Space - Superb article about Linux swap, includes some tuning parameters -- article
lsblk - List block devices -- built-in
ncdu - ncurses version of "du" -- built-in
Parted Magic - Resize, grow, shrink, clone, recovery, wiping, benchmarking, and more. Supports Linux and Windows file systems -- Windows
snapper - CLI tool to manage Btrfs snapshots, snapshot timelines, and more -- various lang
System Storage Manager (SSM) - Generic CLI for managing all types of storage (DM, LVM, multipath), added in RHEL 7 -- built-in

Storage Performance Analysis Tools

Grind your disks into dust - see also Performance Analysis Tools and Tracing and Profiling

blktrace - mount -t debugfs debugfs /sys/kernel/debug && blktrace -d /dev/md2 -o - | blkparse -i - -- article
Bonnie++ - The classic, still updated -- built-in
Connectathon Test Suite - NFS stress testing and benchmarking tools -- various lang
findswappers - perl script that identifies swapped processes -- perl
fio - Supports 19 different I/O engines (sync, mmap, libaio, posixaio, etc), very powerful -- C
Fnotifystat - Dumps the file system activity in a given period of time -- C
iometer - Multi-platform, by Intel -- C++
ioping - Monitor I/O latency in real time -- C
iorate - Originally written by EMC, now open source -- C
iotop - top for I/O requests, displays information on a per-process basis -- Python
IOzone - Supports NFS, still being updated! -- C
Threaded I/O Tester (tiobench) - Threaded I/O tester, tiotest and tiobench -- C

Terminal Tools and SSH Clients

Fancy SSH clients, terminal sharing, and similar tools - see also SSH Tools and Orchestration for parallel SSH tools and Shell Scripting and Tools

Bitvise SSH Client - Feature-rich SSH & SFTP client for Windows, free for individual use -- closed source Windows
Byobu - An enhanced version of the "screen" utility -- shell OS X
ConnectBot - Open source SSH client for Android -- Java Android
Guacamole - Clientless (in-browser) remote desktop gateway, supports VNC and RDP -- various lang
iTerm2 - Killer terminal replacement for Mac -- OS X -- Objective-C
KiTTY - PuTTY fork with additional features -- Windows
MobaXterm - Tabbed SSH, VNC, and RDP client for Windows, free for personal use -- closed source Windows
mRemoteNG - Open source, tabbed, multi-protocol, remote connections manager -- Windows
MTPuTTY (Multi-Tabbed PuTTY) - Multiple PuTTY sessions in a single window -- Windows
NoVNC - Client-less VNC in a web browser, uses HTML5 and WebSockets -- in-browser
PuTTY - The classic SSH client -- Windows
PuTTYtray - PuTTY in the systray + additional features -- C
reptyr - Reparent a running program to a new terminal -- C
screen - Detatch and re-attach to shell sessions while they continue to run in the background -- C
SuperPutty - Allows the PuTTY SSH client to be opened in tabs -- Windows
tmate - Instant terminal sharing, a tmux fork -- OS X
tmux - Alternative to GNU screen, also used for terminal sharing -- C
tmux-cssh - Cluster SSH for tmux -- shell
tmux Resurrect - Persists tmux environment across system restarts -- shell
Warp - Securely share your terminal, like handing a co-worker your keyboard -- Golang
WinSCP - The well-known SCP client -- C Windows
x2go - One of the best remote-desktop-over-SSH clients -- Windows OS X
Xshell - SSH client for Windows, free for personal use -- closed source Windows

Tracing and Profiling

OS kernel and process-level tracing and profiling tools - see also Performance Analysis Tools and Network Performance Analysis Tools and Web and HTTP Performance Analysis Tools and Metrics and Time Series Data and RDBMS Performance Analysis Tools

bcc - Next generation, Linux 4.x kernel tracing tool suite, uses eBPF (Extended Berkeley Packet Filters) -- C
eBPF - DTrace + SystemTap, requires 4.x kernel, mostly uses bcc -- various lang
kdump - Linux kernel dump facility (where to save it, what to save, etc) -- C
Linux Trace Toolkit - Next Generation (LLTng) - Linux kernel tracer and profiler, lower overhead than System Tap -- C
Linux Tracing Workshop - Hands on exercises with perf, bcc, and similar tools -- various lang
ltrace Tutorial - ltrace (library call tracer) tutorial by Red Hat -- article
lttng-analyses - Official collection of LLTNG scripts and snippets -- collection
Mastif Visualizer - Visualizer for the Valgrind's Mastiff utility -- C++
OpenSnoop - Continually monitor for file opens -- shell
OProfile - System-wide statistical profiling tool -- C
perf - User-land performance analysis tool, a sampling profiler -- C
perf-tools - Uses perf and ftrace, includes iosnoop -- Brendan Gregg
pstore - Save kernel crash info in a platform-specific persistent memory so data is not lost (eg: disks failed so write dump to NVRAM instead) -- article
Record and Replay (rr) - Record the failure once, then debug the recording deterministically, supports C and C++, by Mozilla -- C C++
strace - System call tracer for user space processes -- built-in
SystemTap (stap) - Linux kernel tracing and performance analysis tool -- C C++
Valgrind - Tool suite that includes cache profilers, heap profiles, thread race condition checkers, and more - a CPU-level emulator -- C

Two Factor Authentication

Universal 2nd Factor (U2F) is the successor to two-factor authentication / TFA / 2FA and multi-factor authentication / MFA. Avoid using SMS if possible - see also VPNs and Tunnels and Secrets Management

Two Factor Auth (2FA) - Web sites that do and don't support 2FA, organized by category -- checkit collection
CentOS 7 2FA VPN - VPN with CentOS 7 + FreeRADIUS + SSSD + Google Authenticator -- tutorial
FreeOTP - Open source fork of Google Authenticator, by Red Hat -- C mobile
Google Authenticator - Official project, supports Android, iOS, and has a PAM module for SSH 2FA -- C
Nitrokey - Open source thumb drive for authentication -- various lang
pam-u2f - PAM module for auth via U2F compatible devices, by YubiKey -- C
yubico-pam - PAM module for use with YubiKey devices -- C
yubikey-full-disk-encryption - Encrypt storage on a LUKS partition using a Yubikey -- Shell

Virtualization and SDN

OS, network, and storage virtualization, emulation, and simulation including SDN, load balancers, and firewalls - see also Containers for container-only network meshes and VMware Tools

BusyBox - Bootable Linux with tiny versions of many common UNIX utilities in a single small executable -- C
Calico - L3 fabric that runs a vRouter on each node, supports containers -- Python
DOSbox - Open source DOS emulator, great for running old games or utilities -- C C++
FreeNAS - BSD-based NAS, supports ZFS -- C
GNS3 - Cisco and other network simulator that runs in VirtualBox or Qemu/KVM -- Python
HAproxy - Open source software load balancer -- C
haproxyctl - Wrapper to talk to the HAProxy socket, as well as regular init (start stop restart) shit -- Ruby gem
KVM (Kernel Virtual Machine) - The one, the only -- C
kvm-tools - CLI tools for managing qemu-kvm domains -- C
KVM Management Tools - Great list of KVM management tools on the KVM wiki, updated frequently -- collection
libvirt - Open source API, daemon and management tool, used with many virtualization solutions -- C
Linux-IO Target (LIO) - Create and share iSCSI, Fibre Channel, FC over Ethernet, and other storage targets from Linux VMs -- built-in
LVS (Linux Virtual Server) - Linux-based load balancer, also includes the IPVS kernel module -- C
Mininet - Easily setup networks for testing on your laptop with VirutalBox -- various lang
Minio - An open source object storage server compatible with Amazon S3 APIs -- Golang
ns-3 - Network simulator, mostly focuses on wireless IP such as Wi-Fi, WiMAX, or LTE and routing protocols such as OLSR and AODV -- C
Open vSwitch (OVS) - Production quality software switch -- C
OpenFiler - Linux-based NAS, supports most protocols and storage types -- C
Oracle VM VirtualBox - Easy, simple virtualization -- C C++ Windows OS X
oVirt - Virtualization management platform, the upstream for Red Hat Enterprise Virtualization (RHEV) -- Java
Packet Tracer - Cisco network simulator, by Cisco -- closed source Windows OS-X
pfsense - The best firewall software, supports appliances and live CDs -- C
phpVirtualBox - Web front-end for VirtualBox -- PHP
QEMU (Quick EMUlator) - Also supports hardware emulation (SPARC, RISC, etc) -- C
Seesaw - Load balancer based on Linux Virtual Server (LVS), by Google -- Golang
Shadow - Network simulator that runs real applications like Tor and distributed systems of thousands of nodes on a single machine -- C
Squid - Reverse proxy, caching server, web traffic filter, and more -- C++
Traefik - Modern HTTP reverse proxy and load balancer, supports many backends -- Golang
Unicorn Engine - CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc, X86) via QEMU -- various lang
virt-manager - KVM / Xen / LXC GUI -- Python
WANem (Wide Area Network Emulator) - WAN emulator -- C
WINE - Compatibility layer for running Windows apps on POSIX-compliant OSes -- C OS X
Xen - It's a hypervisor! -- C
XenServer - Successor to Xen Cloud Platform (XCP) -- C
xhyve - Lightweight OS X virtualization based on bhyve -- C OS X
ZeroTier - Cloud / provider-agnostic private network backplanes, network virtualization -- C++ all platforms

VMware Tools

Mostly unofficial VMware tools and scripts - see also Virtualization and SDN

Compliance Checker for vSphere - Provides detailed compliance checks against vSphere hardening guidelines, official tool -- closed source
FastSCP - Super fast SCP client for Windows for moving stuff around in a VMware environment (ISOs, VMDKs between data stores, etc) -- closed source
Flings - Tons of very useful apps written by VMware engineers, worth exploring A++++ -- closed source? various lang
Onyx - Do something in vSphere and it will create a PowerCLI script to do that thing that you just did -- closed source PowerShell Windows
open-vm-tools - OSS alternative to VMware Guest Tools -- C
PowerCLI - VMware's CLI -- closed source
RVtools - Killer GUI for viewing information about your VMware environment -- closed source .NET Windows
RVtools Export - Wrapper script to save daily snapshots of your environment using RVtools -- PowerShell
Sexigraph - Graphite-based visualization appliance for Sexilog -- various lang
Sexilog - ELK stack virtual appliance designed for vSphere / VMware ESXi logs -- various lang
vCheck - Get an overview of a new environment or check the health of an existing one -- PowerShell
vDisk Informer - Check vDisks alignment and see if they have wasted space -- closed source Windows
vGhetto Script Repository - Various scripts from virtuallyGhetto -- various lang
VMware Community PowerPack - A variety of scripts from Virtu-al.net and now other blogs such as ict-freak.nl and ntpro.nl -- lost-to-the-internet PowerShell
VMware on Github - VMware's Github repos -- various lang
VMware Sample Exchange - Code samples & scripts by both VMware and the community -- various lang
vSphere Health Check Report - Reports a massive amount of information, run it on a schedule -- closed source perl
vSphere Mobile Watchlist - Monitor VMs on your phone -- closed source mobile

VPNs and Tunnels

VPN client & servers, tunneling proxies, DNS tunneling, simple host-to-host tunnels, and related tools - see also SSL Tools and SSH Tools and Virtualization and SDN

Algo VPN - IKEv2 Ubuntu-based strongSwan VPN server deployed to any cloud via Ansible -- Python
AutoVPN - Spin up and autoconfigure OpenVPN instances in AWS -- Python
CentOS 7 2FA VPN - VPN with CentOS 7 + FreeRADIUS + SSSD + Google Authenticator -- stepbystep
Corkscrew - Tunnel SSH through HTTP proxies -- C
DNS Leak Test - See if DNS queries are leaking outside of your VPN / secured network -- in-browser
dnscrypt-proxy - DNS proxy, with support for modern encrypted DNS protocols such as DNSCrypt v2 and DNS-over-HTTP/2 -- Golang
dnscrypt-wrapper - Add dnscrypt support to any resolver, server-side dnscrypt proxy -- C
fwknop (FireWall KNock OPerator) - Single Packet Authorization (SPA), authoriation packet from you opens firewall rules so only you can get in -- various lang
Go HTTP Tunnel - Fast and secure reverse tunnels over HTTP/2 and TLS, share localhost without having a public IP -- Golang
kcptun - Secure and fast tunnel based on KCP, can increase throughput -- Golang
localtunnel - Share a HTTP/web service on your local development machine without messing with DNS and firewall settings -- JavaScript Windows OS X
MACsec aka 802.1AE - Use me for confidentiality and integrity at layer 2, useful for WAN links -- standard
Magic Wormhole - Safely and simply send arbitrary-sized files and directories (or short pieces of text) from one computer to another -- Python
n2n - L2 over L3 VPN that uses a peer-to-peer architecture -- C
OpenVPN - The one and only -- C
Pritunl - Distributed enterprise VPN server built using the OpenVPN protocol, supports Google sign-in -- Python
Shadowsocks - A secure socks5 proxy, designed to protect your Internet traffic -- various lang most platforms
SoftEther - Perhaps the best VPN software out there -- C
spiped - Create encrypted pipes between socket addresses using pre-shared keys (PSKs), similar to ssh -L -- C
sshttp - Port multiplexer that hides a SSH daemon behind HTTP, HTTPS, or SMTP on a single port -- C
sshuttle - Transparent proxy server / VPN, doesn't need admin, forwards over SSH, supports DNS tunneling -- Python OS X
SSH Through or Over Proxy - How to create a HTTP(s) tunnel for your SSH traffic -- article
Streisand - Set up a server running a wide variety of privacy software, so easy that grandma can use it, Ansible-based -- Python
strongSwan - IPsec-based -- C
stunnel - Create simple TLS tunnels for existing services (eg: telnet, nc, etc) -- C
tinc - Simple, multi-platform VPN -- C
WireGuard - Performant in-kernel VPN server with DJB Crypto and very modern primitives -- C
Ubuntu IKEv2 VPN Setup - Simple script that sets up a IKEv2 VPN with strongSwan on Ubuntu -- shell

Web and HTTP Tools

RPC is dead, long live RPC - see also SSL Tools and Networking Tools

API Blueprint - Supports bindings/plugins for many APIs -- various lang
Awesome JSON - It's the new XML -- collection
Awesome Nginx - A collection of resources covering Nginx, Nginx + Lua, OpenResty and Tengine -- collection
curlish - Improved curl, includes cookie management and OAuth 2.0 support -- Python pip
Fiddler - HTTP/HTTPS debugging proxy for any browser, system or platform -- closed source
GoReplay - Capture and replay HTTP traffic for testing -- Golang
gRPC - High performance RPC via HTTP/2, by Google -- C
h2i - Go's interactive HTTP/2 console debugger, send raw frames, etc -- Golang
Hamms - Simulate/create connection failures, malformed response data, slow servers, fat headers, and more! -- Python
Hipache - Distributed HTTP and websocket proxy, supports load balancing -- JavaScript
htaccess Snippits - Huge collection of common and useful .htaccess snippets, please contribute -- collection
http-traceroute - Shows the entire route including cookies, redirects, and response codes -- Ruby
httpdiff - Perform the same reuqest against two HTTP servers and diff the results -- Golang
httpie - curl replacement with many new features -- Python
htty - A console application for interacting with web servers -- Ruby gem
Huginn - Build agents that perform automated tasks/workflows for you online or locally, like IFTTT -- Ruby
Insomnia REST Client - An alternative to POSTman, additional features -- Electron Windows OS X Linux
JSON Server - Full fake REST API for quickly prototyping and mocking in 30 seconds -- JavaScript
jq - Command line JSON processor and manipulator -- C
Lighthouse - Chrome extension to audit a web page for performance, accessibility, progressive web apps, and more, by Google -- in-browser
localtunnel - Share a HTTP/web service on your local development machine without messing with DNS and firewall settings -- JavaScript Windows OS X
mitmproxy - Intercept, modify, replay and save HTTP/S traffic - even edit flows on the fly -- Python pip
mountebank - Stub downstream resources for testing, supports HTTP HTTPS SMTP TCP -- JavaScript Windows OS X
Newman - CLI companion for Postman -- JavaScript
ng-admin - Add an AngularJS admin GUI to any RESTful API -- JavaScript
nghttp - CLI HTTP/2 client, similar to curl/wget and more -- C
ngrok - Reverse proxy that creates a secure tunnel from a public endpoint to a locally running web service and captures & analyzes all traffic over the tunnel for later inspection and replay -- rocks Golang
OpenResty - Turn nginx into a non-blocking API server -- C
PageKite - Makes HTTP servers or SSH publicly available on any server -- Python
POSTman - Create and share API and HTTP requests, great for testing and sharing -- Chrome
Puppeteer - Provides a high-level API to control headless Chrome over the DevTools Protocol -- JavaScript
Pushpin - Proxy server that adds WebSockets to existing request-response APIs -- C++
RapidJSON - Super fast JSON parser and generator -- C++ Windows
Redirect Detective - See the complete path a redirected URL goes through -- in-browser
Repose - REST proxy, solutions to API tasks such as auth, rate limiting, API validation, HTTP logging, and much more -- Java
Resty - CLI REST client you can use in shell/bash/zsh pipes -- shell
SecurityHeaders.io - Scan your web site's HTTP headers -- in-browser
Swagger - Popular API development library, now the OpenAPI standard -- various lang
tengine - A distribution of Nginx with some advanced features, by Alibaba -- C
tortilla - Easily wrap web APIs -- Python pip
Tyk - API gateway -- Golang
urlscan.io - Displays tons of stats and info about any given URL -- in-browser
Varnish - Caching HTTP accelerator -- C
vcr - Record and play back HTTP sessions -- Ruby gem
webhook - Super simple webhook server -- Golang

Web and HTTP Performance Analysis Tools

Load generation, debugging, benchmarking, and profiling for SaaS, webapps, and HTTP(S) - see also Performance Analysis Tools and Network Performance Analysis Tools

Awesome Web Performance Optimization - Collection of web performance optimization (WPO) tools, articles, and more -- collection
Betwixt - Web debugging proxy with a Chrome DevTools look -- JavaScript
Brotli - Modern alternative to gzip, better packing, performs well with HTTP/2, HTTPS only -- zoooooom
django-debug-toolbar - Panels that display profiling information about the current request/response -- Python pip
Chrome DevTools - Many built-in tools for performance analysis -- mostly OSS
Gatling - HTTP, JMS, and WebSocket load generator -- Scala
Firefox Developer Tools - A full list of built-in Firefox developer tools including performance tools -- various lang
flask-debugtoolbar - The Django Debug Toolbar ported to Flask -- Python
FunkLoad - Functional and load web tester -- Python pip
h2load - HTTP/2 and SPDY load generation tool, part of the nghttp2 suite -- C
HAR Analyzer - HTTP Archive analyzier for troubleshooting from a browser perspective, by Google -- in-browser
Hey - HTTP load generator written in -- Golang
High Performance Browser Networking - What every web developer needs to know about the various types of networks (WiFi, 3G/4G), transport protocols (UDP, TCP, and TLS), application protocols (HTTP/1.1, HTTP/2), and APIs available in the browser (XHR, WebSocket, WebRTC, and more) -- book
httperf - HTTP load generator, originally created, by HP -- C
httping - Simple program that "pings" a URL and shows response time -- C
JChav - Visualize JMeter output -- Java
Jaeger - OpenTracing compatible distributed tracing system, by Uber -- Golang
JMeter - Designed to load test functional behavior and measure performance, written in Java -- Java
Locust - Load generation tool written in Python that allows you to define user behavior -- Python
ngxtop - Real time top for nginx -- Python
OpenTracing - Vendor-neutral distributed tracing -- various lang
OpenZipkin - Distributed tracing systems for SaaS and webapps, by Twitter, based on Google's Dapper -- Scala
Packetbeat - Distributed packet monitoring system that can be used for application performance management -- Golang
PageSpeed Insights - Analyzes the content of a web page, then generates suggestions to make that page faster, by Google -- in-browser
PageSpeed Module - Open-source server modules that optimize your site automatically (nginx and Apache), by Google -- various lang
peep - Heap inspector for live memcached instances -- Ruby
phantomas - JS web performance metrics collector and monitoring tool -- JavaScript
redis-faina - Query analyzer that parses Redis' MONITOR command for counter/timing stats about query patterns, by Facebook -- Python
Siege - CLI based HTTP load generation tool, supports basic authentication, cookies, and HTTPS -- C
Speed Tracer - Helps you identify and fix performance problems in your web applications, by Google -- Chrome
Tsung - Distributed stress tester, also supports stress testing DBs -- Erlang
vegeta - HTTP load testing tool, written in Go -- Golang
Web Page Test - Free website speed test from multiple locations around the globe using real browsers (IE and Chrome) and at real consumer connection speeds -- in-browser
wrk - Multi-threaded CLI-based HTTP load generation tool -- C
wrk2 - Fork of wrk that fixes the "coordinated omissions problem" -- C
YSlow - Analyzes web pages and why they're slow based on Yahoo!'s rules for high performance web sites, customizable -- JavaScript
UpTrends Uptime Checker - Check a URL's response time from ~30 different sites around the globe -- in-browser
Varnish Dashboard - Realtime dashboard for Varnish cache servers -- JavaScript

Misc Tools and Learning Opportunities

Everything else - see also everything else

Archive.org aka The Internet Archive aka The Wayback Machine - Yo donate, this is beyond important -- the biggest collection
Awesome - Top level list of awesome lists -- collection
AutoHotKey - Automate input (desktop and web forms, data entry, keybinds, etc) -- C++ Windows
Awesome AutoHotKey - A collection of AutoHotKey scripts and libraries -- various lang
BlueStacks - Android emulator that you can run on Windows, run apps from the Play store, etc -- various lang
Caffeine - Simple menu bar app to stop your Mac from sleeping -- closed source OS X
Cloud Design Patterns - Useful for building reliable, scalable, secure applications in the cloud -- collection
Command Line Text Processing - awk grep sed etc - interactive tutorial for newbies -- shell
conserver - Virtual console server with many features (multi-user, console log history, etc) -- C
CRIU (Checkpoint Restore in Userspace) - Freeze a process, save it to disk, then resume it later -- insane
Design Patterns for Humans - An ultra-simplified explanation of repeatable software design patterns -- article
Design Patterns - Wonderful collection of software development design patterns with examples, includes anti-patterns and refactoring guidelines -- collection
DevOps Conferences - Add and remove via PR, please contribute -- collection
f.lux - Changes your screen from blue light to yellow light when the sun sets to tell your brain it's night time -- closed source OS X Windows
Fossor - Automate on-call investigation steps, by LinkedIn -- Python pip
Geocities-izer - Make any HTML web page look like a Geocities page -- sweeeeeeet
Google Advanced Operators for Web Search - Search modifiers for more accurate results, by Google -- collection
Google's Technical Development Guide - Hands on, free, self-paced courses to help you develop your programming skills -- collection
googler - Google search, news, and site search from the terminal, slick -- Python
Hoopla - Digital movies, music and ebooks for USA public library members -- explore yours today
Huginn - Build agents that perform automated tasks/workflows for you online or locally, like IFTTT -- Ruby
inxi - "a full featured system information script" (hardware info, etc) -- shell
Kanopy - Streaming movies for USA public library members -- explore yours today
Libby - App for ebooks and audio books for USA public library members, from OverDrive -- explore yours today Android iOS Windows 10
maybe - Allows a dry run of almost any Linux binary, see the files it will modify, calls made, etc -- Python pip
Memory Management Reference - All in one reference for memory management and garbage collection -- collection
MIT OpenCourseWare - MIT's real course materials from 2400+ courses -- collection
Mjolnir - Automation for OS X, think AutoHotKey for Mac -- C OS X
Multibinder - Simple Ruby daemon that makes true zero downtime reloads simple, by Github -- Ruby
MultiRBL - SMTP blackhole lookup tools -- in-browser
MX Toolbox - SMTP blacklist lookup, header analysis, and more -- in-browser
Network UPS Tools (NUT) - Manage power devices from over 100 manufacturers using a single web interface -- C Windows
Networking Cheat Sheets by PacketLife - Protocols, devices, ports, physical connectors, and more -- collection
Open Source Society University (OSSU) - A complete education in computer science using free online materials -- collection
Open19 - Open data center hardware for standard size racks -- neat
OpenBMC - Framework to build a complete Linux image for a Board Management Controller (BMC), by Facebook -- C
Operating Systems: Three Easy Pieces - Probably the best OS book out there, free -- book
OverDrive - Ebooks and audio books for USA public library members -- explore yours today
OWASP Secure Coding Practices - Quick Reference Guide -- Great cheat sheet, language-agnostic -- collection
PrivacyTools.io - All in one collection, web site source is on GitHub -- collection
runwhen - Utilities for running commands at particular times, cron on steroids -- C
Secure Messaging Apps - True comparison of the technical features and merits of various apps, which are TRULY secure? -- collection
Site Reliability Engineering (SRE) by Google - Full, free, online version of the O'Reilly book -- the best
Steps Recorder (aka Problem Steps Recorder) - Windows 7+, user records themselves reproducing a problem, they send video to you, you playback -- closed source
SymbolHound - Search engine that doesn't ignore special characters, great for programming questions -- try it
The Art of Command Line - The BEST interactive Linux tutorial, newbie focused -- learn it
Twelve-Factor App - Language-independent rules for codebase, dependencies, build/release/run, dev and prod, logs, etc for a cloud/web-centric app -- collection
Twilight - F.lux for Android -- closed source
Unix Rosetta Stone - The one and only resource for a mixed Linux/Unix environment -- translator
Vim Adventures - A game to learn vi / vim using your browser -- in-browser

bilucent/my-links

Table of Contents

Tools by Category

IT News

Linux News and Articles

Linux Message Boards and Forums

Asset Management

AWS Tools

Backups

Chef

Cloud File Sync and Sharing

Collaboration Tools

Configuration Management

Containers

Dashboards and Data Visualization

Distributed Systems Tools

Editors

Git Tools

Graphics Stuff

High Availability Clustering Tools

HPC Tools

Live CD Tools

Logging

Metrics and Time Series Data

Monitoring and Alerting

Networking Tools

Network Performance Analysis Tools

Orchestration

Package Patch and Repository Tools

Performance Analysis Tools

Provisioning Tools

Python Tools and Resources

Python Programming Tutorials

RDBMS and SQL Tools

RDBMS Performance Analysis Tools

Regular Expressions

Ruby Tools and Resources

Ruby Programming Tutorials

Secrets Management

Security Tools

Shell Scripting and Tools

Software Development Tools

SSH Tools

SSL Tools

Storage Tools

Storage Performance Analysis Tools

Terminal Tools and SSH Clients

Tracing and Profiling

Two Factor Authentication

Virtualization and SDN

VMware Tools

VPNs and Tunnels

Web and HTTP Tools

Web and HTTP Performance Analysis Tools

Misc Tools and Learning Opportunities