A free and open source multiplatform 3D parametric modeler
The programmer's solid 3D CAD modeller
A python parametric CAD scripting framework based on OCCT
Free minimalist software for maps, import DWG, DXF, SHP, KML, GeoJSON
Surface Explorer 3D plots mathematical surfaces in 3D.
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
DXF2TXT converter for Linux
DXF to Kicad Module File Converter
collection of illustrative programs:small games, simulators: C, Matlab