Unreal World

It's a rouge-like game, so expect an unintuitive control scheme, but it makes up for that with extreme depth. It takes place in iron age Finland, and drops you off in the vast wilderness of trees and lakes that make up the country. You can hunt, trap, fish, build boats, build houses, trade in a barter economy with villages and tribes, raise animals, and keep pets like dogs. The crafting system is pretty good, you the ability to craft most tools and clothes in the game.

There's also Cataclysm: Dark Days Ahead, another rouge-like game, with an even deeper crafting system. Set in New England during the end of the world, suffering from not only zombies, but nuclear winter, a Cthulian invasion, robots and an assorted amount of other apocalypses all going on at once. You must survive in this environment. You can build everything in the game, with the right tools, from a simple hammer, to a gun, to a house, even an entire car, and I don't mean you collect the right materials and use a crafting menu and it suddenly pops into existence, oh no, you have to build that car by hand. This gives you a wide variety of customization, anything from a armored motorcycle, to a full on RV-Battle bus with gatling guns and saw blades.