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http://www.subsonic.org/pages/index.jsp ?

This seems like an interesting project. I've never heard about it before, though I do wish it was an open-source one...

Subsonic is GPL.

I've been running it for a few years now. I especially like using it with iSub on iOS, though that isn't under active development anymore (it's GPL now, too).

The official android app seems closed source though.

Both Subsonic and the unofficial DSub can be found on F-Droid.

Subsonic + iSub is absolutely wonderful, been a huge fan of that combo for years.

I moved personally to Ampache http://ampache.org which I found lighter and smoother than Subsonic, and it is working with Subsonic clients.