What options do I have for self-hosted end to end encrypted group chat?

Question

Hey, trying to set up an end to end encrypted group chat stack for some friends. What options are out there besides Matrix?

warrenm · Accepted Answer

Jitsi supports it - https://jitsi.org/e2ee-in-jitsi/

stop50 · Answer

Jabber/xmpp

cranberryturkey · Answer

i'm working on something now https://qrypt.chat

hexfish · Answer

Maybe Jami, haven't looked at it for a while: https://jami.net/

stmw · Answer

Signal

footoverhand · Answer

Delta-chat? Email based.