Form-Code is a project mainly written in C++ and C, it's free.
Form+Code Implementations of code from Form+Code, a book by Casey Reas, Chandler McWilliams, and LUST Original code in Processing here: http://formandcode.com/code-examples/
Javascript/Canvas resources: API reference: http://simon.html5.org/dump/html5-canvas-cheat-sheet.html Mozilla Tutorial: https://developer.mozilla.org/en/Canvas_tutorial
Three.js: https://github.com/mrdoob/three.js/
Cinder: http://libcinder.org/