Zulip : Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conve...
Growth Book : Growth Book is an open source experimentation platform designed for companies that want to bring A/B testing in-house, but don't want to build it them...
extramuros : This is software for collaborative live coding. On one machine, you run an extramuros "server". Then, from as many machines as you like, you use a web...
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...
human.io : A system for coordinating the activities of users via their mobile phones.
Isso – Ich schrei sonst – is a lightweight commenting server written in Python and JavaScript. It aims to be a drop-in replacement for Disqus.