Topic per title, basically.
For me: after setting up all the integrations and fall overs using the arr stack and Jellyfin (inc Sabnzdb etc)… I keep circling back to Nova video player.
https://github.com/nova-video-player/aos-AVP/releases
It’s arguably not even self hosting…but there something undeniably cool about sticking a USB stick into a router, installing a single app on your TV and boom, done. EDIT: of course, it can consume the *arr stack, integrate with Ombi etc
IOW, I really like stuff that simple to set up and punches above its weight class.
I still love getting messages via xmpp from friends and family using my own snikket/ejabberd instances after years of use. Calls as well.
Video conferences via jitsi meet fill my heart with joy since the covid epidemic. These are also xmpp based. It’s just a cool lightweight protocol.
XMPP is nice but even with all of the quality of life extensions it definitely feels clunky. I tried switching to it recently from matrix and while matrix leaves a lot to be desired I found it was more useful in its current form than XMPP.