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Gmsh - Gmsh is a 3D finite element grid generator with a build-in CAD engine and post-processor.
FreeCAD - An open-source parametric 3D modeler
NETGEN - NETGEN is an automatic 3d tetrahedral mesh generator.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Altair - Visually Analyze Any Data at the Speed of Business
SketchUp - 3D for Everyone