HEATKEYS

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

Computer simulation of vehicle dynamics for ride, handling, braking, and acceleration of cars, trucks, motorcycles, and motorsports with Windows OS and real-time systems.

IDEAS is a central index of economics and finance research, including working papers, articles and software code

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

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

An online center for Computational Fluid Dynamics. Services include a comprehensive link section, a jobs database, a CFD-Wiki, and a discussion forum. This is the largest CFD site on the net.

Gamma Technologies is the number one supplier of engine and vehicle simulations

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

Railroad links directory & search engine with 17,000 railroad websites: train travel, model railroads, railfanning, train simulators & rail industry.

The largest amateur Unmanned Aerial Vehicle (UAV) community on the web.

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

Blender is the open source, cross platform suite of tools for 3D creation.

Scientific Literature Digital Library incorporating autonomous citation indexing, awareness and tracking, citation context, related document retrieval, similar document identification, citation graph analysis, and query-sensitive document summaries. ...