Raphaël : Raphaël is a small JavaScript library that should simplify your work with vector graphics on the web. If you want to create your own specific chart or...
Vex : Vex is a modern dialog library which is highly configurable, easily stylable, and gets out of the way. You'll love vex because it's tiny (6kb minified...
Autotrack : Automatic and enhanced Google Analytics tracking for common user interactions on the web.
Not all browsers support stack traces on error objects, but TraceKit squeezes out as much useful information as possible and normalizes it.