musiqpad - Musiqpad is a social-music software platform for users to host their own ‘pads’ (rooms).
Openwhyd - Collect and Share the tracks you love.
üWave - üWave is a self-hosted collaborative listening platform.
Twinjack - Stream Spotify music with anyone with just a link
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
ReverbNation Discover - Stream hand-picked, ad free music from emerging artists.