XUIML for Adobe Flex is a framework and markup language to create Adobe Flex user interfaces quickly and without coding a single line of ActionScript. The XUIML terminal connects to any SOAP or RESTful Web service and expects simple UI instructions such as "open window", "add tab panel", or "draw textbox", which are then rendered as Adobe Flex widgets.
Sigma Visual builder is a WYSIWYG tool for rapid Web application design and involved script programming. With this powerful builder, Web applications can be developed using only drag and drop, just like what you do in VB or Delphi. More than 35 common AJAX components, including Tabs, Dialog, TreeGrid, TimeLine, and many other Web GUI components are supported. Its rich client-side API works with any backend (such as PHP, .NET, Java, or Python) or static HTML pages. The generated application has wide cross-browser compatibility.
The Widget Jones Library is a lightweight, flexible, template-driven widget build system. It is intended to simplify creating portable widgets. Write your code once, build it with WJL, then run it on several widget platforms like Apple Dashboard, Windows Vista Sidebar, iGoogle, and more.
IT Mill Toolkit is a server-side RIA (Rich Internet Application) library that provides a versatile set of AJAX widgets for Java programmers. Applications are programmed in Java and executed server-side. At the client-side (i.e. in the browser), enhanced GWT widgets are used for presentation.