So naturally a lot of people are going to hate it.
Unreal World(URW) is a game 20 years in the making -- as described
here. So far it's quite fun if a bit slow. The learning curve, so far, is a lot less steep than, say, Dwarf Fortress. Essentially, you're put in Iron-Age Scandinavia and made to find your way in the rough wilderness, and you're free to forge your own path however you see fit. You could become a hermit, trader, fisherman, hunter, mercenary, etc. Every action is done from the skills menu, so something like casting a fishing net or building a fire is easy if you know what you need to do it. Character creation is a little unorthodox, and can take a while, but it's worth it once you get further into the game.
WebsiteDownloadWikipedia PageThe payment plan for this game escapes me. You can get a free version, or you a paid version. The differences between the two so far have only manifested themselves to me as extra starting scenarios.