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Zulip
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
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fosscord
Discontinued 📬 Spacebar is a free open source selfhostable discord compatible communication platform [Moved to: https://github.com/spacebarchat/spacebarchat]
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Scout Monitoring
Free Django app performance insights with Scout Monitoring. Get Scout setup in minutes, and let us sweat the small stuff. A couple lines in settings.py is all you need to start monitoring your apps. Sign up for our free tier today.
What's the issue with clones like FossCord? What exactly should be different? What's "wrong" with the existing solutions? Because you don't mention that at all.
What's not open source of Revolt Chat? Last time I checked, they were using GPL 3.0.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.