BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
foobar2000 - An advanced freeware audio player for the Windows platform.
Twinjack - Stream Spotify music with anyone with just a link
Quorus - A new way to listen to music through collaboration
noidd.com - Enable users to share music and videos LIVE with others people on customizable channels.
üWave - üWave is a self-hosted collaborative listening platform.