Surprised someone mentioned these. I picked up 2 of them a while back when you could get them individually for ~$30. I'm using one at a vacation home with zigbee/zwave2mqtt which then lets me integrate it all into home assistant at the main house. Been super stable and small enough to tuck away in a closet.

Only downside is the limited 8gb storage, but it's enough for a minimal linux install with a couple containers. You just can't beat a regular x86 pc when it comes to just being able to install an up to date distro of choice.