Bandhub - Connect with like minded musicians and make music online
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Vampr - Connect with musicians, industry & music lovers alike
Music Player Daemon - Music Player Daemon is a flexible, powerful, server-side application for playing music.
Listen: The Gesture Music Player - A music player you can use without looking at it. Works seamlessly with Apple Music.
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.