Heartbeat - Listen to music with your friends together, on Spotify
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
Parallel - Listen to music with friends over Spotify at the same time
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
Partyhero - Pass your friends the aux!
Quorus - A new way to listen to music through collaboration