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Autodesk AutoCAD - Autodesk AutoCAD is a commercial computer-aided design (CAD) and drafting software application.
FreeCAD - An open-source parametric 3D modeler
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
SketchUp - 3D for Everyone
BRL-CAD - BRL-CAD: Open Source Solid Modeling
IGiS CAD - 2D Drafting & 3D Modelling Redefined with IGiS CAD