Click Here : http://www.atunes.org/
aTunes [its Open Source] is a full-featured Music-Player and Manager inspired from iTunes.
Currently plays mp3, ogg, wma, wav, flac, mp4 and radio streaming, allowing users to easily edit tags, organize music and rip Audio CDs.
Its mainly built over Audio Engine of MPlayer, but can be changed later on as per user's choice.
Its built-up in Java, multi-platform and has a Jar Installer that is mulit-platform installer
Features I liked:
>> Good Lyrics and Info showing Pane on side... let you search lyrics from 3 engines (though in browser)
>> List out videos for currently viewed song available on Youtube!...