Pyro - Spotify music voting for parties
Parallel - Listen to music with friends over Spotify at the same time
SameTunes - Music social network to compare, share, and discover music.
Join My Playlist - Listen to music live together with your friends in Spotify.
AutoBeat Player - Discover, share & play music from YouTube, SoundCloud, ..
TuneMeet - Chat with people who are listening to the same song