Cross-platform Open-source 2D CAD
OpenNum lets you distribute solvers with a nice graphical interface
CAD 2D for Land Surveying and Civil
A designer’s program for describing parts of the building
2.5D CAD CAM emphasis on CAM and toolpaths
Simple CAD program
T.H.O.R.I.U.M. - Thermooptic radiation iterative universal module.
Tekla IFC Tagger
Drawing robot for electrical interconnection diagrams in DXF.