Stoat (formerly known as Revolt) is a selfhostable, FOSS replacement for discord [Group chats and voice channels you can join any time].
Cool new name, however not as easy to use in other languages.
Voice chat is stil not officialy implemented.
Self-hosting there. Apparently nothing to do for you if you had already hosted before the name change.
The Android app has unfortunately disappeared (not been updated) on F-droid.
Edit: added short description for clarification
Why not any of the other Matrix clients? I’ve got some friends on Element with some bridges and it’s pretty much perfect.
The UI of the ones I’ve tried (schildichat, fluffy, element) felt very unintuitive to me. Spaces were really awkward because it was a different paradigm.
I’m hoping that the familiarity of cinny will help with wider adoption.