A free and open source multiplatform 3D parametric modeler
Cross-platform Open-source 2D CAD
Open Source Desktop GIS with Surveying and Cartography Functionality
Automated detection of the unknown early map projection
Open DXFs with QCad
library to read dwg & read/write dxf files
Software for design single skin kites, speedgliders and paragliders
collection of illustrative programs:small games, simulators: C, Matlab