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I self-host an instance of Lychee for all my family photos: https://lycheeorg.dev/

There are things I really like, e.g. that you can restrict access per user.

But there's no comment/chat/discussion facility, so you cannot easily get feedback on your photos.

There's also NextCloud, but I think the solutions there are a bit more rudimentary. However, if you already use NextCloud (or a similar solution like a CMS for example), you could look for a plugin. https://nextcloud.com/

I highly suggest Immich [1], it's an open-source and self-host alternative for Google Photos. It's still under very active development, but I think it's the best out there.

[1] https://immich.app/

This looks really nice

Check out ente.io, they offer both hosted and self-hosted.

Synology NAS with their photos app can do that. I.e. create albums and share them with other people

I even have a Synology NAS and for some reason have never thought to use it for this