RMP allows remote control over playing your music files on a Linux computer. The music can be controlled via a Web interface, a smart cellphone, iPhone, Blackberry, or through a command line shell interface. If you like the song, you can download it to your phone. It supports next, searching, and volume control.
UpUp is an iPhone game set in a magical world full of music, where you must help a stubborn PumpkinHead to keep jumping up and up. It looks very easy, but actually is not that simple. Jumping on platforms creates melodies. Different instrument tunes are available at different score levels.
BackPlay a program that plays music files from a folder in the background. At login, it scans a directory called "BackPlay" under the user's Music directory, and begins playing any music files it finds there in random order. BackPlay is independent from iTunes. It can be paused from an icon in the status area.