Jellyfin is great but has some issues that can make it annoying. The 3rd party clients are often better than the normal interface. The server is easy to set up. So I can recommend all of it.
Honestly though, just because it isn't updated doesn't mean it is not great. I always revert to Clementine myself. Still use it daily and love it. There is an updated variant called strawberry which is updated and works great, but the remote doesn't work.
All of these recommendations are great. I'm always pleased to see so many cinemaphiles. I like lists, and have found many of my favorites from them.
Ebert's Great Movies List is perfect.
The Criterion Closet Picks, see the greats talk about the greats.
The Janus Collection has a lifetime of stuff.