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Portals
- MatWeb — Material propery data
- Octopart — Search engine for electronic parts
- TraceParts — A huge choice of 2D & 3D CAD files, models and drawings.
- Trace Parts Online — Free 2D & 3D CAD files, models and drawings of mechanical, electrical & mechatronics part catalogs
- TSF Global Fastenting Solutions — (Spain)
- Zycon — Industrial directory, engineering resource, and vertical search engine