I'm a big DeaDBeeF user on mac, and it has reasonable Cocoa UI (so it looks and feels native!) - this is actually pretty unusual for players on the platform!
I make a few tweaks (it's open source, so you can!), but it is very pleasant to use and lets me treat my music as just a collection of playlists rather than railroading me into a big complicated media library tracking system.
Additionally, the main developer is pretty active and it is getting a lot of love in bugfixes and updates for newer macOS, and pull requests and issues get actively looked at as well.
edit: oh, and the codebase was quite nice and easy for me to dig into as well :)
I make a few tweaks (it's open source, so you can!), but it is very pleasant to use and lets me treat my music as just a collection of playlists rather than railroading me into a big complicated media library tracking system.
Additionally, the main developer is pretty active and it is getting a lot of love in bugfixes and updates for newer macOS, and pull requests and issues get actively looked at as well.
edit: oh, and the codebase was quite nice and easy for me to dig into as well :)