An Audio/MIDI multi-track sequencer
fl_toadflax is a viewer/editor for abc music notation files
XiX Music Player is a multi-platform music player
Music score editor
A console-based media player frontend
Trigger sound files for live performances
Open source broadcast automation software for scheduling and playout
Audio player, transcoder and cd ripper
Music juke box for Raspberry Pi, web/mobile inteface
Ubuntu GUI to control iDevice music playback (requires app)