Formerly started at YCombinator
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BitBucket - free for open source and private repositories
GitHub - free for open source repositories, paid for private repositories
GitLab - free for open source and private repositories
Gitorious - free for open source repositories
CodePlex - free .NET Open Source Project Hosting
Google Code - Git/Mercurial/SVN Project Hosting
Nodejitsu - free Node.js hosting for open source projects
NuGet - free .NET Project Hosting
Python Anywhere - hosting for Python projects - has limits
SourceForge - Git/Mercurial/SVN Project Hosting
AppVeyor - Continuous Integration for .NET
Bitrise - Continuous Integration for mobile (currently iOS, Android coming soon as of January 2015)
Coveralls - Code Coverage History
dploy.io - continuous deployment for GitHub, BitBucket or your own Git/SVN repository - free for one repository
dotCover - .NET Code Coverage and Unit Testing - free for open source, Outercurve developers - request needed
Drone - CI for GitHub and Bitbucket - free for open source
Gitlab-CI - on-premises CI for GitLab - free and open source
JRebel - Instant Deployment for Java
Sauce Labs - CI for GitHub, Google Code, SourceForge with Selenium - free for open source
Scrutinizer - CI for GitHub and BitBucket - free for open source
Semaphore - CI for GitHub and BitBucket - free for open source
Team City - free for open source - strict rules - request needed
Travis CI - CI for GitHub - free for open source
Zutubi Pulse - 1 server, 5 agents, unlimited users - request needed
Bugsnag - Multilanguage Crossplatform Error Monitoring - free for open source - email request needed
Codacy - Automated Code Review for Scala, JavaScript, PHP, Python and CSS - free for open source
CodeClimate - Code Review for Ruby, JavaScript, PHP - free for open source
Crowdin - free for open source - request needed
Transifex - Localization Platform for Web
Blackfire - PHP Profiler by creators of Symfony
dotMemory - .NET Memory Profiler - request needed
dotTrace - .NET profiler - request needed
SensioLabsInsight - Code Quality Assurance Tool by creators of Symfony - free for open source
YourKit - Java Profiler
Helpmonks - Team email management. Simplified. - free for open source projects and non-profit organizations
MailChimp - free for 12,000 emails to 2,000 subscribers
AppCode - Objective C IDE - free for open source, Outercurve developers - request needed
IntelliJ Idea - Java IDE - free for non-Apache developers, Apache developers, Outercurve developers - request needed
PhpStorm - PHP IDE - free for open source, Outercurve developers - request needed
PyCharm - Python IDE - free for open source, Outercurve developers - request needed
RubyMine - Ruby IDE - free for open source, Outercurve developers - request needed
WebStorm - JavaScript, CSS, HTML IDE - free for open source, Outercurve developers - request needed
ReSharper - free for non-Apache developers, Apache developers, Outercurve developers - request needed
Taiga.io - Agile project management platform - free for public projects
Teamwork - free for 2 Projects, 10MB Storage
Trello - simple bugtracker - free for all
YouTrack - free for open source - request needed
GoDaddy - free for one year for open source projects
Razuna - Worlds most popular open source Digital Asset Management. 30 days free trial
https://www.atlassian.com/opensource/overview
https://mremoteng.atlassian.net/wiki/display/MR/List+of+Free+Tools+for+Open+Source+Projects http://ossperks.com/