https://retro64mod.github.io/

https://github.com/n64decomp/sm64

https://github.com/libsm64/libsm64

https://github.com/SuperSonicHub1/awesome-libsm64

Also, Mario 64 decomp has been applied to various other games, including 2D games like Super Tux.

You can even play Mario 64 in Blender.

Additional games: