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!
Thomas Network - ThomasNet.
ActCAD - ActCAD is one Software for many applications covering the primary domains of – Architecture, Engineering, Construction (AEC) including Structural, Electrical, and Mechanical.
SketchUp 3D Warehouse - The place to share and download SketchUp 3D models for architecture, design, construction, and fun.
Thingiverse - Thingiverse.com is the place to share digital designs for fabricating real, physical objects.
RealityMAX - RealityMAX is the most powerful free 3D design collaboration platform, 100% online. Cooperate remotely with your colleagues on 3D projects and easily share your work with clients. Create Web3D and AR experiences in a snap, without a line of code.