humit - A social networking app for music sharing and discovery.
OutLoud Social Jukebox - Control the music with your friends in real-time
Heartbeat - Listen to music with your friends together, on Spotify
Jukebox - Collaborative music player
Twinjack - Stream Spotify music with anyone with just a link
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...