• 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 (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.
• Docker: https://github.com/sagemathinc/smc/tree/master/src/dev/docker

• Tim Clemans
• John Jeng
• William Stein
• Harald Schilly
• Hal Snyder

• Greg Bard
• Rob Beezer
• Keith Clawson
• Andy Huchala
• Jon Lee
• Simon Luu
• Nicholas Ruhland
• Todd Zimmerman

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

The copyright of SMC 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.

• 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

   Client    Client    Client   Client  ...
     /|\
      |
   https://cloud.sagemath.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