Free programs I use often and highly recommend
Blender
https://www.blender.org/3D modelling + animation and a lot more features that far exceed what a human can learn in their lifetime. Not very intuitive, so be prepared to watch some tutorials before diving in
Godot
https://godotengine.org/Game engine which is evolving at a rapid pace. Way better than Unity in all design decisions and very lightweight
Anki
https://apps.ankiweb.net/Flashcards app. Very useful for memorizing everything, from languages to math formulas. Decks made by other users are available on many topics if you don't want to create them yourself.