lib2geom (2Geom in private life) is a library developed for inkscape to provide a robust computational geometry framework. It is not a rendering library, instead concentrating on high level algorithms such as computing arc length.
Xul Dev means for Xul development environment. The IDE is intended to design Xul interfaces and to make programs in any programming language. The IDE is written in Scriptol C++ and available in source form and as binary executable.
VIDK will allow gamers to create unique virtual game items (e.g. swords, guns, wands, armor etc.) that they can import into a veriety of games.
GardenSketch (previously iGarden) is a set of programs to aid in designing your garden or larger landscape project.