Sonerezh : A self-hosted, web-based application for stream your music, everywhere.
cal.com : Open source meeting scheduling tool. Send a link, let others book a slot. Calendly alternative.
Garage : An open-source distributed storage service you can self-host to fullfill many needs.
Riot : Riot allows teams to communicate across a wide range of collaboration apps. If some team members use Riot while others use IRC, Slack or Gitter, Riot ...
Kinto : Kinto is a lightweight JSON storage service with synchronisation and sharing abilities.
Plausible is a lightweight and open-source website analytics tool. It doesn’t use cookies and is fully compliant with GDPR, CCPA and PECR.