Free and extensible Linux/Unix audio editor. GNU licence.

Free music score editor published under the GNU GPL. Offers features like MIDI playback of written notes and chord markings, and supports many formats like MusicXML, ABCMusic, or Lilypond.

Synthesizer with two engines, realtime polyphonic, Midi support, microtonal capability, effects.

Assists in moving gramophone records onto CDs. Filters out hiss and pops.

Realtime signal analysis and spectrum analyzer tool.

A digital audio mixing package.

Audio player based on GTK+ written in Python, lets users make playlists with regular expressions and provides advanced tag editing features.

MIDI/Audio sequencer with recording and editing capabilities.

An object-oriented class library for audio signal processing.

Audio sampler with features similar to hardware samplers. Offers speed, high audio quality rates, supports common sample library formats.