• SageMathCloud
• Github
• Developer mailing list

• git clone https://github.com/sagemathinc/smc -- copy repo
• cd smc/src
• npm run install-all -- build
• npm test -- run test suite
• install.py all --compute --web -- build and install some parts system-wide for development use
• See INSTALL.md for more details.

• William Stein, SageMath Inc and University of Washington -- founder; everything
• Harald Schilly, Vienna, Austria -- everything
• Tim Clemans -- fontend work
• John Jeng -- frontend work
• Hal Snyder -- backend Python-related work
• Simon Luu -- frontend work (chat)
• Todd Zimmerman -- screencasts
• Greg Bard -- updating the FAQ; documentation

• Jon Lee, University of Washington -- frontend work, history viewer
• Rob Beezer, University of Puget Sound -- design, maintenance
• Nicholas Ruhland, University of Washington -- frontend work, tab reordering and resizing
• Keith Clawson -- hardware/infrastructure
• Andy Huchala, University of Washington -- frontend work, bug finding

SMC is 100% open source, released under the GNU General Public License version 3+:

Copyright (C) 2014 -- 2016, SageMath, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

We test SMC via Travis CI. Here are the results:

• master:

DevOps note: The relevant files are:

• .travis.yml - to tell travis-ci what to do (two modes: client and server)
• smc/*/test/mocha.opts - defaults for running mocha
• smc/package.json - the "scripts" section (overwrite mocha reporter, only call coveralls when on travis-ci, etc.)

• Client -- javascript client library that runs in web browser
• Load balancer/ssl -- HAproxy
• Database -- RethinkDB
• 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
• admin.py -- Python program that uses the paramiko library to start/stop everything
• The Cloud -- Google Compute Engine

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