Heartbeat - Listen to music with your friends together, on Spotify
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
üWave - üWave is a self-hosted collaborative listening platform.
musiqpad - Musiqpad is a social-music software platform for users to host their own ‘pads’ (rooms).
Quorus - A new way to listen to music through collaboration