You could use the GPU to help host a peertube instance.

For XMPP, the Movim client is currently the best option as a discord alternative.

It has group voice and video calls, screensharing w/audio (need a chromium browser to share the audio for now), and just added discord-like channels with rooms (though it’s not as smooth as Discord). The Dev plans to implement drop-in voice rooms at some point as well.

I’m sure there’ll be lots of bugs and I don’t think it will scale well.

The lack of scaling and even more critically, lack of federation, unfortunately makes this not a viable alternative, at least not for Discord as it is used today. As a smaller self-hosted option that is just for use between a friend group, it’d probably be fine. It just won’t be able to replace the exact use-case of Discord, such as allowing for easily bringing new randos you meet into a call without them having to sign up to your specific server.

The Discord-alternative landscape is filled with people vying to take its place, but I think we would be better served rallying behind Movim and XMPP, IMHO. Or Fluxer, if they eventually can enable federation.

I think it’d be better if we stuck with Movim instead, which is already built on a proven scalable and most importantly federated back-end (XMPP), and also already offers text, group audio and video calls, screensharing w/ audio (have to use chromium based browser for now to stream the audio), and even some pretty decent encryption.

It’s our most promising Discord alternative out of many.

Whether or not XMPP is a Signal or a Discord replacement is dependant on the client.

For a Discord replacement, there is the Movim XMPP client, which has group audio/video calls, screensharing (w/audio using chromium based browser), support for gifs and videos within the chat, and very soon Discord-like servers with rooms, after which the dev plans to work on drop-in voice chat rooms.