Semgrep : Semgrep is a fast, open-source, static analysis tool that searches code, finds bugs, and enforces secure guardrails and coding standards. Semgrep supp...
Zulip : Powerful slack-like open source group chat
OpenPhoto : A free, hosted, portable and open source photo sharing service. A photo application that lets you store your photos on Dropbox, Amazon S3 or in your g...
Bridgy : Bridgy pulls comments, likes, and reshares on social networks back to your web site. You can also use it to post to social networks - or comment, like...
Kanboard : Kanboard is a free and open source Kanban project management software.
CryptoZombies is a free, open source, interactive code school that teaches you to build games on Ethereum. The course is designed for beginners to Solidity and starts off with the absolute basics.