Audio software that uses GTK

free Digital Audio Workstation

CD-Ripper

server-side application for playing music

TuxGuitar is a free and open-source tablature editor, which includes features such as tablature editing, score editing, and import and export of Guitar Pro gp3, gp4, and gp5 files. In addition, TuxGuitar's tablature and staff interfaces function as basic MIDI editors.

Denemo is a scorewriter and music sequencer. Denemo has been under development since 1999.

TiMidity++, originally and still frequently informally called TiMidity, is a software synthesizer that can play MIDI files without a hardware synthesizer. It can either render to the sound card in real time, or it can save the result to a file, such as a PCM .wav file.

CD ripping program

free software