BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
Heartbeat - Listen to music with your friends together, on Spotify
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...
Quorus - A new way to listen to music through collaboration
üWave - üWave is a self-hosted collaborative listening platform.