Luxilla is a runtime/browser that turns XUL (XML User Interface Language) into live windows, dialogs, menus, toolbars and more without requiring a single-line of Java code. Pass on the chrome folder holding your XUL markup and see it come alive.
Xi3D is an X3D renderer and browser for 3D Web content. It contains compliant parsers for VRML'97 types, a java scenegraph, XML bindings using SAX2, a content converter, full runtime and event model, DOM Level 2, vecmath