Models, textures, animation, programming, some sounds:
Justin Couch

Impact sounds:
Xiaopack (Public Domain)

Curved world shader example:
Alastair Aitchison
https://alastaira.wordpress.com/2013/10/25/animal-crossing-curved-world-shader/

Fonts:
Licensed under the SIL Open Font License
http://scripts.sil.org/OFL

Sztylet
Cannot Into Space Fonts, PlusOne Fonts
https://fontlibrary.org/en/font/sztylet

Overpass
Delve Withrington, Thomas Jockin
https://fontlibrary.org/en/font/overpass