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Inventor - Inventor is a 3D CAD software that lets you quickly create 3D models with embedded intelligence, intuitive workflows, and optimized performance.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
IronCAD - IronCAD is intuitive 3D CAD software that increases efficiency and can be used standalone or to complement an existing design environment.
FreeCAD - An open-source parametric 3D modeler
Ayam - Ayam is a free 3D modelling environment for the RenderMan interface, distributed under the BSD...
SketchUp - 3D for Everyone