Sonic Pi - Sonic Pi is a new kind of instrument for a new generation of musicians. It is simple to learn, powerful enough for live performances and free to download.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
SuperCollider - A real time audio synthesis engine, and an object-oriented programming language specialised for...
GNU Octave - GNU Octave is a programming language for scientific computing.
ChucK - A strongly-timed music programming language
Wolfram Mathematica - Mathematica has characterized the cutting edge in specialized processing—and gave the chief calculation environment to a large number of pioneers, instructors, understudies, and others around the globe.