Modeling Tools

 Blenderhttp://www.blender.org/powerful open source 3D modeling program, complete with physics engine, game engine, and many other features
 SCAD http://www.openscad.org/ OpenSCAD is a software for creating solid 3D CAD objects. It is free software and available for Linux/UNIX, MS Windows and Mac OS X.
 Google Sketchup http://www.sketchup.com/ fairly easy to use 3D modeler, proprietary
 Cadmium https://github.com/jay3sh/cadmium Python library similar to SCAD
   
   
   
   
   
   
   
   

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