Amazon’s releasing their very own game engine. Lumberyard, as they call it, is based on Crytek’s famous CryEngine, and can be used to develop games for both PC and consoles. It’s also free to download, and comes with “no seat fees, subscription fees, or requirements to share revenue.”
You could get the budding lumberjack in your life an axe for the holidays, but what's the fun in that? If he's going to chop down his own Christmas tree, he should do it with an axe he made himself.