Openwhyd - Collect and Share the tracks you love.
NodeJS Music Server - A stateless NodeJS app that leverages AWS S3 & serves music through a REST API
SoundClick - SoundClick is a music-based social community.
MusicDB - MusicDB is a music manager, server and player that focus on music.
Music Smasher - Find any song. Music Smasher searches Spotify, Rdio, SoundCloud, Bandcamp, and YouTube.
Polaris - Polaris is a music streaming application, designed to let you enjoy your music collection from any computer or mobile device.