Luxor is a free, open-source XML UI Language (XUL) toolkit in released under the GNU General Public License (GPL) that lets you build UIs using XML and includes an ultra-light weight, multi-threaded web server, a portal engine, a template engine (Velocity), a scripting interpreter (Python) and more. XUL stands for XML UI Language and was pioneered by Mozilla. XUL is superior to API-based UI toolkits such as Swing or WinForms because it clearly separates the user interface into four parts: content (structure and description of UI elements), appearance (look & feel, skin, themes), behavior (scripting) and locale (localization information for internationalization) . Luxor XUL home is
here.
