Openwhyd - Collect and Share the tracks you love.
SoundClick - SoundClick is a music-based social community.
musiqpad - Musiqpad is a social-music software platform for users to host their own ‘pads’ (rooms).
Music Smasher - Find any song. Music Smasher searches Spotify, Rdio, SoundCloud, Bandcamp, and YouTube.
Spotibot - Spotibot uses the listening habits of millions of people to help you find your new favourites.
FoxTube - Play YouTube video continuously with playlists. FoxTube features: