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wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual. Our multilingual how to manual has free step-by-step instructions on how to do all types of things.

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

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

3D AutoCAD Pipe Fittings, Libraries and Downloads

Autodesk is a world leader in 3D design software for manufacturing, building, construction, engineering, and entertainment. Since introducing AutoCAD in 1982, Autodesk has developed a broad portfolio of 3D CAD software programs to help users visualiz...

Yahoo! Answers is a new way to find and share information. You can ask questions on any topic, get answers from real people, and share your insights and experience.

SketchUp - Engineering Tools and Components

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WikiAnswers: Questions and Answers from the Community

ESRI is the world leader in GIS (geographic information system) software and technology. This site features GIS mapping software, map Web services, online mapping and GIS training, demos, data, product and service information, support, user scripts, ...