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LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
FreeCAD - An open-source parametric 3D modeler
NttCAD - Free 2D/3D CAD software, easy to use and multi-platform
SketchUp - 3D for Everyone
TYCAD - TYCAD is a application for computer aided drafting (CAD) in two dimensions (2D).
Autodesk AutoCAD - Autodesk AutoCAD is a commercial computer-aided design (CAD) and drafting software application.