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"3dMdb acts as a search engine for 3D models of all shapes and sizes. You can set parameters to search for free models, specific price ranges, and over 35 different platforms...This search engine is similar to CGTrader. Instead of hosting 3D models, it simply supplies a quick and expansive way to find exactly what you’re looking for."--ALL3DP review.
The NIH 3D Print Exchange provides models in formats that are readily compatible with 3D printers, and offers a unique set of tools to create and share 3D-printable models related to biomedical science. (Includes prosthetic files)