Jajuk - Jajuk is software that organizes and plays music using Java.
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Roon (Music Player) - Roon is a music playing application for audiophiles
Nightingale - Nightingale is a free and powerfull music player for Linux, Windows and Mac
Sayonara Player - Sayonara is a simple but nice audio player and holds a lot of features like a library, id3 tag...
Pi MusicBox - Pi MusicBox is a great music platform where you can create songs and is the only streaming music player for Spotify, Google Music, Podcasts, SoundCloud, Webradio, and others.