

It allows any device to cast music to pretty much any other device that supports Spotify, whether via phone app, browser or Linux app. I have a couple of small computers connected to receivers in different rooms and can control the music playing on them from the attached PC itself or any other PC or phone.
It looks like Jellyfin + Mopidy will do the same thing as Spotify Connect which is my most used app/service. Will take a closer look. Self host various other things so adding a new app wouldn’t be an issue. Thanks for the list.