Openwhyd - Collect and Share the tracks you love.
Parallel - Listen to music with friends over Spotify at the same time
musiqpad - Musiqpad is a social-music software platform for users to host their own ‘pads’ (rooms).
Join My Playlist - Listen to music live together with your friends in Spotify.
Spotibot - Spotibot uses the listening habits of millions of people to help you find your new favourites.
TuneMeet - Chat with people who are listening to the same song