As a FOSS advocate, I am quite astonished that this space has no FOSS "product." I mean PBX has things like asterix. We have good servers like ejabberd and prosody for XMPP. There are excellent voice chats like mumble.

Basically, Discord, but based on an open protocol to enable better interoperability. With a meeting functionality where you can send links that works directly in browser with no account. Also the discord video chat UI is garbage.

I know there are things like revolt chat. But my point is, I'm surprised that this is not more "filled".