There's also DMG-LIB[0] and KMODDL[1] which contain mechanism animations along with CAD models of some mechanisms. It's been mentioned before, but thang010146's youtube channel also has many of these mechanisms, sometimes they even have CAD models available of their models. I suspect that thang010146 might actually have the largest digital repository of mechanisms.

[0]https://www.dmg-lib.org/dmglib/main/portal.jsp [1]https://engineering.library.cornell.edu/kmoddl [2]https://www.youtube.com/user/thang010146