MochiKit : MochiKit is a highly documented and well tested, suite of JavaScript libraries that will help you get shit done, fast.
MochiKit

Overview
MochiKit is a highly documented and well tested, suite of JavaScript libraries that will help you get shit done, fast. We took all the good ideas we could find from our Python, Objective-C, etc. experience and adapted it to the crazy world of JavaScript.

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Features

  • Lightweight
  • Modular
  • Object-Oriented JavaScript framework
  • Cross-browser code
  • Well Documented