A python parametric CAD scripting framework based on OCCT
Surface Explorer 3D plots mathematical surfaces in 3D.
The programmer's solid 3D CAD modeller
SOLVESPACE is a free (GPLv3) parametric 3d CAD tool.
Converts between many 3D data formats
Application for management of CAD files and projects
3D Engine with some extra features based on the D3x3D Engine for VB6