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GrabCAD - a free CAD model library with 2D / 3D CAD files available for software like SolidWorks, AutoCAD, Autodesk Inventor, Solid Edge, SketchUp etc.

3D models for CAD/CAM/CAE designers. Cars, cities, airplanes and other polygonal and NURBS/SOLID models.

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Tuts+ teaches creative and technical skills across many topics to millions of people worldwide. We offer tutorials, articles, news and insights that help you take your knowledge to the next level.

Graphisoft is the maker of ArchiCAD, a 3D architectural design software with sophisticated 2D drawing and layout functions for architects, interior designers and structural engineers.

For people who want to make things themselves, Autodesk 123D is free 3D modeling software integrated with content and fabrication services.

3D Communication software for Design and Engineering Professionals.

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Empowering anyone to create and publish 3D online through our 3D platform of community, 3D content, and free 3D software.