Vierstein (FourStone) is a RPG creation and playing kit based upon games like Unlimited Adventures. It uses a custom, and hopefully inventive, rule-set that focuses on single player environment. Built upon Python and Pyui.
Sakura is a Knowledge Navigator and User Interface for UNIX, which implements HyperMedia and its own windowing and packing system, both in the main program and in an extensive API for Tcl and other languages.
SeVeraGe is a project aimed at leveraging SVG's capabilities in the real world! This is the home of iSVG, multi-language SVG DOM implementations and a few converters.