Heartbeat - Listen to music with your friends together, on Spotify
Spotify Mosaic - Creates a Mosaic of an Image from Selected Spotify Playlist
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
Something In Common - The playlist game.
Join My Playlist - Listen to music live together with your friends in Spotify.
Spotify - Map shows when two people play same song at same time