Cool libraries to do awesome things !

KineticJS

https://github.com/ericdrowell/KineticJS/
Description: With this you can build a small game or dynamic UI that runs in the browser. It has good 2D drawing capabilities as well as animations and user-control - which means you can do for example a car games! Maybe in the future someone will create a self-contained GUI package to run in standalone mode Javascript GUI applications as if it was in a browser.

OpenCV

Opensource Computer Vision
License: BSD (so it is commercial friendly and open source !)
Description : 3D rendering and hardware acceleration capabilities. Open-source and cross-platform support !