GTA V also free on origin. Too bad my pc can't handle it.
Eae torialidade
unreal engine 5
quixel with unlimited access for free (a texture editor software plus a library with many textures with 4k quality)
you now only have to pay royalties if your game reaches U$1.000.000 revenue
and epic online services which allow you to develop a online game with matchmaking, lobby and other features without having to pay anything