Luxor is an open-source XML UI Language (XUL) toolkit in Java that lets you build desktop apps using markup (XML) and scripting. Luxor also includes a web server, a portal engine (supporting RSS), a template engine (Velocity) and more.

Luxor implementation is independent of the Mozilla

Mozilla

Mozilla is a term used in a number of ways in relation to the Mozilla.org project and the Mozilla Foundation, their defunct commercial predecessor Netscape Communications Corporation, and their related application software....

 codebase, though they implement largely the same specification of XUL

XUL

In computer programming, XUL , the XML User Interface Language, is an XML user interface markup language developed by the Mozilla project. XUL operates in Mozilla cross-platform applications such as Firefox...

.

Articles

XUL: The Gatekeeper to Higher-level Web UIs DevX Article by Laurence Moroney (Senior Architect Reuters Innovation Labs and Rapid Development Group, New York City), June 2004.