LilyPond sheet music text editor
Audio Editor
Reorganize M32/X32 show files
A free multi-track audio editor and recorder
Free open source DAW, MIDI sequencer, software synthesizers
utility to split mp3, ogg vorbis and FLAC files without decoding
Open source brainwave entrainment application
Free and Open Source Brainwave Entrainment application
patch editor for the E-MU Proteus 2000 synthesizer family
Library to perform read/write of ID3 tags in MP3 files