LavishGUI 2
From ismods.com: dedicated to promoting white hat, EULA-compliant Inner Space and LavishScript mods
LavishGUI 2 is a rendering engine in development for Inner Space 2, designed to support a sufficient subset of XAML and WPF functionality, and interoperating with LavishScript 2. Developers can expect to use standard tools from Microsoft, e.g. Visual Studio 2012, to develop their GUI.