Jukebox - Collaborative music player
Openwhyd - Collect and Share the tracks you love.
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
musiqpad - Musiqpad is a social-music software platform for users to host their own ‘pads’ (rooms).
PartyOn - Let everyone DJ together, anywhere
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!