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SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory

Thousands of file extensions with detailed information about each file type, including a list of programs that open the files.

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

Having problems opening a file? We will help you find products that can open, view or play your files.

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Instructables is the Biggest How To and DIY community where people make and share inspiring, entertaining, and useful projects, recipes, and hacks.

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.

The Khronos Group is a not for profit industry consortium creating open standards for the authoring and acceleration of parallel computing, graphics and dynamic media on a wide variety of platforms and devices. Current APIs are OpenGL, OpenCL, OpenG...

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