List of 3d platformers that i can think off, starting with the staple Mario franchise, some hits, followed by some indie games and some more old classics by the end (remaster/remake/compilations will be used to shorten the list, but go see all of them)
It includes from the most platformy and level base ones to the ones with "big" worlds and lots to collect (aka collectatons) and even some that are not EXACTLY in the genre but will probably be appreciated by fans of the genre.

*Still want to add more classics at the end someday