The Force is an open source, web-based live-coding environment for writing audio responsive GLSL fragment shaders.
Code is automatically compiled, and only executed when the compiler doesn’t return an error. Results and unforeseen happy accidents are seen instantly. Audio sources can be from microphone, line in, file, or soundcloud stream. Rudimentary bi-directional Open Sound Control is possible.
Check it out on github, contribute, or play with it.