FreeCAD

FreeCAD screenshots

FreeCAD is a general purpose Open Source 3D CAD modeler.
Main window
FreeCAD 0.1 : Main window

Alternative downloads

DraftSight
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It is free 2D CAD software that lets you create, edit and view DWG files.
Consideo Modeler
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Flexible and feature-rich project simulation tool.
Live2D Cubism Modeler
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2D modeling tool for Mac.