Prosody (XMPP server). Setup takes an hour at most even if you have never worked with Lua. Easy to interact with (it has a built-in shell), easy on system resources, and easy-to-understand config. Support for groups, E2EE, attachments including videos and voice recordings, among others.
Prosody (XMPP server). Setup takes an hour at most even if you have never worked with Lua. Easy to interact with (it has a built-in shell), easy on system resources, and easy-to-understand config. Support for groups, E2EE, attachments including videos and voice recordings, among others.