Spotify - Map shows when two people play same song at same time
SoundNode - SoundCloud desktop app (OS X, Windows, Linux)
SoundCloud - Enjoy music & follow favourite artists
BeardedSpice - BeardedSpice is a menubar application for Mac OSX that allows you to control web based media...
Ampache - Web ( HTTP centralized ) based audio/video streaming application
Atavi - Your bookmarks are always close at hand!