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GrabCAD Library - The GrabCAD Library offers millions of free CAD designs, CAD files, and 3D models. Join the GrabCAD Community today to gain access and download!
STLFinder - The 3d models search engine.
Thomas Network - ThomasNet.
Thangs3D - Thangs3D is an online community for engineers and visual designers that provides unlimited downloads of 3D models and CAD designs.
ActCAD - ActCAD is one Software for many applications covering the primary domains of – Architecture, Engineering, Construction (AEC) including Structural, Electrical, and Mechanical.
CGTrader - CGTrader is an online marketplace at which artists can sell and buy Revit and 3D models.