Youtube-DJ - Mix YouTube songs together
Parallel - Listen to music with friends over Spotify at the same time
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!
Slackbox - Spotify playlist collaboration through Slack
YOU.DJ - Mix SoundCloud music and Youtube videos live in your browser.
Join My Playlist - Listen to music live together with your friends in Spotify.