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LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
FreeCAD - An open-source parametric 3D modeler
DeltaCAD - Powerful, easy to learn 2D CAD (Computer Aided Design) program designed to meet all of your CAD...
gCAD3D - 3D - CADCAM - Software for MS-Windows and Linux. Freeware
QCAD - QCAD is an application for computer aided drafting in 2D.
nanoCAD - nanoCAD is a pro-grade 2D CAD system with native DWG support and full customizability.