Codeberg is one option. I think they run Forgejo.

It’s not exactly what you’re wanting, but there is Remote Video Camera on F-Droid.

If I were doing it, I would look for an app that just implements the same basic functionality as a network-connected camera. Then video storage, alerting, motion detection, etc. would all be handled by something like zoneminder.

In my experience, printers in general are terrible, but HP LasetJet Enterprise m series printers are excellent.