You can use Flatpak as well?

It’s voice and video calling with chat and screensharing. I intend to use it for a language school. It’s extendable, for instance you can also self-host a whiteboard, where everyone can draw. You can see the drawing in real time, which is good for asian languages, where direction of the stroke is important.

Free, open-source, packaged in Debian, runs without issues, used it with friends for multi-hour voice chats during gaming nights.

On the server you can configure things like FPS for screenshare. I have yet to adjust that and try streaming video/game through it.

Way too few mentions of Jitsi.

I use it with friends, it has good server config, and I’m pushing it on businesses.