Not a ton of stuff, but I'm currently looking at some more, thanks to this thread.

At home:

• Open Media Vault on an RPi 4, with some containers, namely:
  • qBittorrent
  • PhotoPrism (not especially functional, more a proof-of-concept)
  • mariadb
• PiHole on an RPi 3
• Volumio on RPi3s + DAC (x2)

On a Singapore-based VPS:

• Nextcloud