Sigma Visual Ajax GUI Builder

Sigma visual builder is a web based tool for AJAX RIA application UI rapid design and involved scripts programming.You can do everything by drag & drop with a significant development time reduction. It provides more than 40 common components, including Tabs, Dialog, TreeGrid, TimeLine and many other web GUI components.It's also compatible with jQuery, prototype, mootools and other javascript frameworks.

Home: http://www.sigmawidgets.com/
Demo: http://www.sigmawidgets.com/products/sigma_visual/Samples/
Download: Sigma Visual GUI Builder V2.02 (Zip 6.9MB)