Subsonic - Subsonic is a free, web-based media streamer, providing ubiquitous access to your music and video.
Openwhyd - Collect and Share the tracks you love.
CherryMusic - A music streaming server written in python:Stream your own music collection to all your devices!
Zoff - Collaborate on a live music and video playlist with your friends.
Ampache - Web ( HTTP centralized ) based audio/video streaming application
SoundCloud - Enjoy music & follow favourite artists