MythTV for the AV ... Volumio too, but, not upgrading that to v3.
Not seen radicale mentioned here...
I was an early adopter of OwnCloud and then switched to Nextcloud and, well, just gave up with it... no-one edits documents on it, we don't look at photos on it, but we did use a shared calendar... so I ditched that, installed radicale and been much happier (ie less admin time, more life time)
Also running syncthing from our phones to a home built NAS and a tablet in the kitchen as the NextCloud photo upload was (still is?) broken.
I run Arch btw
Home Assistant of course... MotionEye in a Pi Zero...
And it's all behind a pfSense box with DNS and GeoIP blockers installed.
Oh, and EmonCMS for my SolarPV.