[FooNull]

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...

[__david__]

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).

[ncza]

The official android app seems closed source though.

[dublinben]

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