Zepto.js is a JavaScript framework for mobile apps and sites, with a jQuery-compatible syntax. The goal is have a 2k library that handles most basic drudge work with a nice API that you might already know so you can concentrate on getting stuff done.

Zepto.js is about 10 times smaller than jQuery or Prototype, yet provides a large subset of the features those libraries offer, thanks to all the goodness of advanced JavaScript and new DOM features in mobile WebKit browsers.

Requirements: -
Demo: http://zeptojs.com/
License: MIT License