Nyquist is a language for sound synthesis and music composition.
audio sequencer
An Internet Browser Based Piano and Drum kit Software
An entire virtual orchestra in LV2 plugin format
Max-objects-&-patches for Algorithmic Composition and statistical DSP
A binary waveform synthesizer based on Timewave Zero
Buzztrax is a modular music composer for Linux
Synthesizer, mixing, sound effects, music composition and production.
free cross-platform music creation software
Type in chord progressions, and hear them played on guitar
SuperCollider Code for Livecoding Experimental Sound
Computer Music Programming Language