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Autodesk AutoCAD - Autodesk AutoCAD is a commercial computer-aided design (CAD) and drafting software application.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
BricsCAD - A powerful CAD platform, with features familiar to you from native .dwg applications.
FreeCAD - An open-source parametric 3D modeler
SketchUp - 3D for Everyone
GstarCAD - GstarCAD is an affordable, cost-effective, DWG-compatible CAD software covering a wide range of industry from architecture, mechanical, interior design, construction to engineering.