Capture in-game models using OGLE
"Raph Koster points us to a useful piece of kit: OGLE, the OpenGL Extractor, is a tool for extracting 3D models from OpenGL applications. By sitting between the application and the OpenGL library, OGLE can effectively take 3D screenshots--and the possibilities for gaming are immense. "
K3DSurf : 3d surface generator
"Because Mathematics can be so fun!K3DSurf is a program to visualize and manipulate Mathematical models in three, four, five and six dimensions. K3DSurf supports Parametric equations and Isosurfaces."