CoCalc

Collaborative Calculation in the Cloud

CoCalc offers collaborative calculation in the cloud. This includes working with the full (scientific) Python stack, SageMath, Julia, R, Octave, and more. It also offers capabilities to author documents in LaTeX, R/knitr or Markdown, storing and organizing files, a web-based Linux Terminal, communication tools like a chat, course management and more.

Website

CoCalc -- the online service
Github
Mailing List

Very easy install of CoCalc on your computer

You can easily use CoCalc on your own computer for free by running a Docker image.

History

CoCalc was formerly called SageMathCloud. It started to offer way more than just SageMath and hence outgrew itself. The name was coined in fall 2016 and changed around spring 2017.

Contributors

Current highly active contributors

Harald Schilly
Hal Snyder
William Stein
Travis Scholl

Past contributors

John Jeng
Greg Bard
Rob Beezer
Keith Clawson
Tim Clemans
Andy Huchala
Jon Lee
Simon Luu
Nicholas Ruhland
Todd Zimmerman

... and many others: See https://github.com/sagemathinc/cocalc/graphs/contributors

Copyright/License

The copyright of CoCalc is owned by SageMath, Inc., and the source code here is released under the GNU Affero General Public License version 3+. See the included file LICENSE.md.

None of the frontend or server dependencies of SMC are themselves GPL licensed; they all have non-viral liberal licenses. If want to host your own SMC at a company, and need a different AGPL-free license, please contact help@sagemath.com.

Trademark

"CoCalc" is a registered trademark.

ARCHITECTURE

Client -- javascript client library that runs in web browser
Load balancer/ssl -- HAproxy
Database -- PostgreSQL
Compute -- VM's running TCP servers (e.g., sage, console, projects, python3, R, etc.)
Hub -- written in Node.js; primus server; connects with everything -- compute servers, database, other hubs, and clients.
Storage -- Snapshots of project data
HTTP server -- Nginx

Architectural Diagram


   Client    Client    Client   Client  ...
     /|\
      |
   https://cocalc.com (primus)
      |
      |
     \|/
 HAproxy (load balancing...)HAproxy                  Admin     (monitor and control system)
 /|\       /|\      /|\      /|\
  |         |        |        |
  |http1.1  |        |        |
  |         |        |        |
 \|/       \|/      \|/      \|/
 Hub<----> Hub<---->Hub<---> Hub  <-----------> PostgreSQL <--> PostgreSQL  <--> PostgreSQL ...
           /|\      /|\      /|\
            |        |        |
   ---------|        |        | (tcp)
   |                 |        |
   |                 |        |
  \|/               \|/      \|/
 Compute<-------->Compute<-->Compute <--- rsync replication  to Storage Server, which has ZFS snapshots

Acknowledgements

Browserstack

We are grateful to BrowserStack for providing infrastructure to test CoCalc.

Development

Prerequisites

node
Postgres
pip install pyyaml; pip3 install pyyaml

Installation

The following instruction don't install CoCalc. They're for development purposes only!

Install node.js version 10.x (we don't support 12.x as of Feb 2020).
git clone --recurse-submodules https://github.com/sagemathinc/cocalc -- copy repo
cd cocalc/src
npm run install-all -- build
npm test -- run test suite (expected failures if your clock is not UTC)
install.py all --compute --web -- build and install some parts system-wide for development use
See INSTALL.md for more details.

For further options please go here.

paul-snively/cocalc