Sonar is a Navidrome / Subsonic client for Mac.
Issue tracker, todo list: https://todo.sr.ht/~not/sonar
I am trying to make it as simple as possible. It's not intented to be full-featured client, but a small and convenient tool.
This project does not have any 3rd party dependency except a modified version of SPMediaKeyTap, which is already included with the source code. Just open with Xcode and you should be able to build and run.