GUI designer for the C++ GUI library wxWidgets and its Python, Perl and C# bindings. wxDesigner lets you visually create dialogs as well as menus and toolbars. It also comes with a built-in syntax hilighting editor with context sensitive help where you can add application skeletons, new GUI classes, event handlers, getters etc. in a RAD like fashion. It has virtually identical support for all supported languages (C++, Python, Perl, C#) making transition easy. wxDesigner can also create output in the XML format that is the resource format for wxWidgets and its language bindings.