Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
humit - A social networking app for music sharing and discovery.
Twinjack - Stream Spotify music with anyone with just a link
Heartbeat - Listen to music with your friends together, on Spotify
Parallel - Listen to music with friends over Spotify at the same time
aux.app - A free web-based music platform to play music from other popular online streaming services.