more than 2 million data made public by the Smithsonian and Open Access content for any purpose, for free, from portraits of historic Americans to 3D scans of dinosaur fossils. 3D models can be downloaded as OBJ files or in glTF format. https://www.si.edu/openaccess
Download over 2,000 free 3D models from Smithsonian’s online archive under a CC0 license