Heartbeat - Listen to music with your friends together, on Spotify
aux.app - A free web-based music platform to play music from other popular online streaming services.
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
Jukebox - Collaborative music player
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
CueBot - A better way to request for songs at a party 🎉