Sencha Ext JS - Sencha Ext JS is the most comprehensive JavaScript framework for building data-intensive, cross-platform web and mobile applications for any modern device. Ext JS includes 140+ pre-integrated and tested high-performance UI components.
jQuery - The Write Less, Do More, JavaScript Library.
Zepto.js - Zepto is a minimalist JavaScript library for modern browsers with a largely jQuery-compatible API.
Harp - The static web server with built-in preprocessing.
qooxdoo - qooxdoo is a universal JavaScript framework that enables you to create applications for a wide...
Umbrella JS - Tiny library for DOM manipulation, events and AJAX