I found this list: https://github.com/meichthys/foss_photo_libraries/tree/main
Which seems to be only a year old. I’ve also installed PhotoPrism and the jury is still out because there’s gaping holes and issues I don’t know if I can resolve.
My focus is not on storage or I’d just do NextCloud. I want all the bells and whistles. Good face detection, scene and object detection / TensorFlow, reverse geocoding with an API like MapBox, automatic album and filenames using machine learning.
I was really hoping there would be one obvious front-runner.
The situation is kind of disappointing, more like hopeless I’d say for power users. Photoprism is by far the best I’ve found too, but still isn’t replacing Google Photos, where I still dump everything too, and I go there more often than not to find stuff. Of note about Google Photos is not only the uncanny face recognition, I have a person with pictures from literally 0 years old to I don’t even want to calculate what age now, “driving age” anyway - but beside faces and things it also does OCR (text), which can be VERY useful. And it’s also processing videos, too!