Viz4D - Viz4D helps you create top-performing web-based 3D viewer that works great on mobile and VR. It is tailored for real-time Archviz walkthrough, 3D product configurator and presentation.
TurboSquid - TurboSquid offers 3D models for professionals.
Sketchfab - Sketchfab is an industrial design software tool is useful for ideation and for beginners in the industrial design field.
STLFinder - The 3d models search engine.
Zakeke - Zakeke is an all-in-one Visual Commerce Platform that empowers eCommerce businesses with live product customization, advanced 3D visualization, immersive Augmented Reality and Virtual Try-On.
3DOcean - 3D Models & Accessories From $1 for 3D Models, Textures, Materials & Shaders, 2D Concepts...