sketchfab.com
Sketchfab is a platform for publishing, sharing, and discovering 3D content on web, mobile, AR, and VR. It offers a universal 3D/VR viewer that works in all browsers and operating systems without a plugin, and uses compression to deliver models. Users can embed and share 3D models on websites, forums, and social media. The site also offers free 3D models under Creative Commons licenses.