CavePainting
CavePainting is a relatively simple but powerful program for sketching 3D models in virtual reality. As opposed to more traditional CAD or animation style 3D modeling programs, CavePainting is easy to learn and is focused on exploring a style of computer graphics driven by hand-based input, like drawing or painting.
CavePainting is used extensively by the CS137 class, Virtual Reality Design for Science.
Though the name implies that CavePainting runs only in the Cave, it also runs in the fishtank with the Phantom haptic device under the name "Drawing on Air", and it can also run on the desktop.
Running CavePainting
Config Files
See the technical user documentation.
Interacting with CavePainting
See the Use Cavepainting HOWTO.
Developing CavePainting
The most up-to-date version of CavePainting is checked in at $G/src/kuchora. "Kuchora" is Swahili for "to draw".
You may want to check out the bug list.
HOWTOs
You can see a complete list in the CavePainting HOWTO category page.