Features: Sigma visual builder is web based tool for AJAX RIA application UI rapid design. It also is scripts programming tool that lets you build such UI. With this tool developers will be able to develop the rich internet applications as easily as program development in Visual Basic or Delphi environments. Sigma visual PHP, AJAX framework is a set of AJAX GUI components. It also has the WYSIWYG visual builder required for the job. You are able to do everything by drag & drop and reduce significant amount of development time. It has more than 40 common components built into the application. These include tabs, tree, treegrid, calendar, menu, dialog, timeline and many other web GUI components.

It has rich client-side API that works with several back-ends like PHP, .Net, Java, python or static HTML pages. Code produced is compatible with IE6+, firefox1.5+, opera9+, safari3+ and Google Chrome. The development framework is compatible with iQuery, prototype, mootools and other frameworks. Detailed manual and API documentation makes using this tool fairly easy for the programmers it is addressed to. It is available under both a commercial license and LGPL license. The interface is simple and straightforward. Code can be viewed in straight listing mode or a structure mode which is easier at debug time. The design view gives you the view of the widgets and their interconnectivity.

Overall: Nice development environment that is easy to use and has a lot of documentation support. The manual could have been more readable.