Sigma visual builder is web based tool for AJAX RIA application GUI rapid design and involved scripts programming.WYSIWYG GUI builder. Do everything by drag & drop. More than 40 common components, including Tabs, Dialog, TreeGrid, TimeLine and many other web GUI components. Rich client-side API, works with any backend or static HTML pages. Wide cross-browser compatibility. Dual Licenses - Commercial License and LGPL license both available.