HEATKEYS

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

308 piston 3D Models (.max, .3ds, .obj, .lwo, .fbx) for purchase and free download. 3 piston General Media.

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

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

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

Vimeo is a respectful community of creative people who are passionate about sharing the videos they make. We provide the best tools and highest quality video in the universe.

YouTube is a place to discover, watch, upload and share videos.

3d models - Buy and sell. The3dStudio.com is one of the largest royalty free 3D resource sites on the Internet. Buy, sell, and trade 3D Models, Stock Photos, Stock Images, Textures, Tutorials, and more for 3ds max, 3d studio max, Cinema 4D, Maya, Lig...

Cadyou is a free resouce for creative commons licensed 3D Models, CAD Blocks and Textures

3D Studio-max - 3D Studio Resource Site free 3D Studio Models 3D Studio Materials Textures 3ds max

3DXtras.com offers thousands of free 3d models to download in .MAX, .3ds and other format, you may use these models freely in your own work as royalty free unless stated.

Download free 3d models and 3d tutorials for Maya, 3ds max and in various 3d formats like MAX, Maya, Obj, Lightwave and .3ds format

MathWorks is the world’s leading developer of technical computing software for engineers and scientists in industry, government, and education