I discovered feishin today on Github. It's made by the creator of sonixd, another great jellyfin/subsonic desktop client.
Works super smooth. Feels basically like Spotify desktop, but FOSS.
The only missing feature for me is the ability to cache songs for offline playback.
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It plugs into Jellyfin, a self-hosted alternative to Spotify/Netflix, (and the topic of this sub :) )
I connect it with my navidrome server it’s a good subsonic client