Zulip : Powerful slack-like open source group chat
Lemmy : Lemmy is a selfhosted social link aggregation and discussion platform. It is completely free and open, and not controlled by any company. This means t...
Tiny Tiny RSS : Tiny Tiny RSS is a free and open source web-based news feed (RSS/Atom) reader and aggregator.
Documize is an open source modern, lightweight and comprehensive alternative to Confluence.
It's built with Golang + EmberJS and compiled down to a single executable binary for Linux, Windows and macOS.