Youtube-DJ - Mix YouTube songs together
Slackbox - Spotify playlist collaboration through Slack
PlayDeck - A DJ Player in browser 🎶
Partyhero - Pass your friends the aux!
Edjing - Discover edjing and edjing Pro, the most powerful DJ apps for music lovers! Mix on Android, Windows and iOS devices and record then share your DJ sets!
Songmash - Create playlists with music that you and your friends love