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OpenSCAD - OpenSCAD is a software for creating solid 3D CAD objects.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
FreeCAD - An open-source parametric 3D modeler
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Sculptris - Sculptris: Enter a world of digital art without barriers.
QCAD - QCAD is an application for computer aided drafting in 2D.