Navidrome server on the NAS. If I'm away from home and using a computer, I have it exposed to the internet and just use the web app.

On my home computer I've been using PsySonic lately and like it quite a bit. Quirks here and there, but it does get updates.

On my phone, and so just about everywhere, I use Symfonium. None of the FOSS apps I found last year did it for me. Symfonium is ridiculously customizable.