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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...
SketchUp - 3D for Everyone
QCAD - QCAD is an application for computer aided drafting in 2D.
Autodesk AutoCAD - Autodesk AutoCAD is a commercial computer-aided design (CAD) and drafting software application.