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LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
DeltaCAD - Powerful, easy to learn 2D CAD (Computer Aided Design) program designed to meet all of your CAD...
FreeCAD - An open-source parametric 3D modeler
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TYCAD - TYCAD is a application for computer aided drafting (CAD) in two dimensions (2D).