The programmer's solid 3D CAD modeller
A math-inspired CAD program in haskell. CSG, bevels, and shells
Optical Simulation software
a parametric 3D CAD modeler
Create and edit LDraw™ parts quick and easy.
3D slider puzzles for kids; helps teach solid geometry
SOLVESPACE is a free (GPLv3) parametric 3d CAD tool.
NETGEN is an automatic 3d tetrahedral mesh generator
Open Source Solid Modeling CAD
Geometry processing library for Python
Free 3D Mobile CAD
CSG for jMonkey
Imagin Raytracer is a multithreaded command line raytracer
Solid Modeling Framework in GPU
Simplified 3D Model Editor, Suitable For Beginners
3D modeling for everybody