There are two projects I would mention in the same spirit:
- https://github.com/photoprism/photoprism
- https://github.com/pixelfed/pixelfed
While I think photoprism has a very similar scope, pixelfed has stronger emphasis on federation. The project website gives a nice overview over different providers:
There is another interesting project. It's more of a lightweight and simple photo gallery.
- https://photoview.github.io
- https://github.com/photoview/photoview