OpenTTD https://www.openttd.org/en/ It is an open-source project based on the 90s DOS game Transport Tycoon Deluxe and it has been in development for years (still is). You basically need to setup a transportation empire, and you can build roads, trains, planes, and ships. It runs on any system, and it can actually look really impressive if you have a bad-ass setup. The things you can do in this game are very impressive. Look at what this guy has built. http://www.tt-forums.net/viewtopic.php?t=61532 Anyway, check it out. You'll probably love it.