I got distracted from my work so I made some Continuwuity propaganda. Continuwuity is a lightweights Matrix chat server that you can self-host pretty easily. Give it a try :3
use of UwU in something I absolutely need to share with others
It's purely a backend, what's under the hood is not really visible to matrix clients.
Edit: Though I wish this graphic communicated that more, just realized it doesn't even say anything about [matrix].