MusicZen - mp3 file organizer
Emit - Emit can stream from a Windows/Mac/Linux machine to an android/iOS device.
Harmony Music Player - Music player with sleek interface & cloud compatibility
VPlayer - VPlayer - a free music player for VKontakte.
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Vinyl Music Player - A fork of Phonograph Music Player that "makes all Pro features free, as they used to be".