Sayonara - Linux audio player and music library manager
Jajuk - Jajuk is software that organizes and plays music using Java.
Mopidy - Mopidy is an extensible music server written in Python. Mopidy plays music from local disk, Spotify, SoundCloud, Google Play Music, and more. You edit the playlist from any phone, tablet, or computer using a range of MPD and web clients.
Roon (Music Player) - Roon is a music playing application for audiophiles
Oceanaudio - Ocenaudio is a cross-platform, easy to use, fast and functional audio editor.
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.