Home Server: Raspberry Pi 4 with an HDD (I've had bad luck with trim support on USB adapters for SSDs)

Open source software: Home Assistant, Home Intent, pihole, miniflix, pinry, and bookstack.

Small self developed software: Chore tracker, Package tracker, Chromecast radio streamer, and a simplistic Trello board

I'm just happy that all that works as well as it does on a single pi with a few users.