Mopidy – Server which can play music from multiple sources 12 years ago
It is unclear to me if tomahawk provides a single frontend or if the frontends are also pluggable. My main use case for mopidy is to allow me to treat Subsonic as if it were a local MPD server instead of using the web interface.
I've written the Subsonic backend, which is available at https://github.com/rattboi/mopidy-subsonic/