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.
KGD is intended to be an animation tool for creating simple 2D vector animations.
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.