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http://www.openlaszlo.org/

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The OpenLaszlo platform allows developers to create applications with the rich user interface capabilities of desktop client software and the instantaneous no–download Web deployment of HTML. These applications run on all leading Web browsers on all leading desktop operating systems from a single XML code base. Earthlink, Yahoo, Behr Paint, La Quinta and many others rely on OpenLaszlo to deliver state-of-the–art applications serving millions of users. The OpenLaszlo platform is open source and free for development and deployment.

The OpenLaszlo Platform

OpenLaszlo applications are written in XML and JavaScript — just like DHTML, but portable across browsers. An OpenLaszlo application can be as short as a single source file, or factored into multiple files that define reusable classes and libraries.