The one that was way more useful then expected is immich. I have over 100,000 photos I took during my life and it usually takes me DAYS to find a specific picture I need.
I installed immich and let it AI scan everything for a week or something. Now I can search for something specific like “it’s a black square in the middle of the photo and has a little knob on it” and it finds me the photo I need.
It’s also cool to see photos of people, organized by the individual by searching their name or clicking on their face.