Just from the top of my head:

• Navidrome (Music)
• Audiobookshelf (Audiobooks)
• Paperless-ngx (documents)
• Joplin (notes, lists and more)
• Komga (comics)
• Mealie (mealplanner, recipes, shopping lists)

Edit: I left out some stuff that you or others already mentioned. But here’s the extended list so I can copy/paste this if someone else asks in the future.

• Immich (photos)
• Home Assistant (home automation)
• Jellyfin (Movies, TV series and more)
• Calibre & Calibre-Web (ebooks)
• Pi-hole (DNS sinkhole)
• Vaultwarden (password manager)
• Nextcloud (data sharing)
• Homarr (Dashboard)
• Headscale (Tailscale Server)

Honorable mention:

• Proxmox (Hypervisor)
• Portainer (Container Management) - I know a lot of people wouldn’t recommend it for various reasons, but works alright for me