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.
Resolume - Resolume is an application for live video performances.
SuperCollider - A real time audio synthesis engine, and an object-oriented programming language specialised for...
MadMapper - The Mapping Software
ChucK - A strongly-timed music programming language
Linux Show Player - Sound player designed for stage productions