Let's see.
- A meda stack (plex/jellyfin, sonarr/radarr, sabnzb, etc).
- an instance of foundryvtt
- a local mirror of 5e.tools
- a "tilt pi" ( Bluetooth hydrometer that supports webhooks/apis)
- ad (I need to decom this and just use aad)
- some raspberry pi's running octoprint.
- pihole.
- "general networking stuff" (wire guard, openvpn, network monitoring, etc)
- nginx as a reverse proxy.
I'm sure I'm missing stuff but that's a basic list.