The Yahoo! User Interface (YUI) Library is a set of utilities and controls, written in JavaScript, for building richly interactive web applications using techniques such as DOM scripting, DHTML and AJAX. The YUI Library also includes several core CSS resources. All components in the YUI Library have been released as open source under a BSD license and are free for all uses. YUI version 2.3.0 has just released on July 31, 2007 with six new additions to the library as well as a new skinning architecture and a new visual treatment for most of our UI controls. The new features include Rich Text Editor, Base CSS, YUILoader Utility, ImageLoader Utility, Color Picker Control, YUI Test Utility.

Requirements: Modern Browsers
Demo: http://developer.yahoo.com/yui/examples/
License: BSD License