FreeCiv is an amazing clone of the old Civilization games. It got stuck somewhere between Civ 2 and Civ 3 as far as the graphics are concerned, but the game play is as much fun as in the original. Plus, it’s open source and hence hackable, has a scripting interface (at least in the soon to be released version 2.4) and has built-in hackability.
Here is a quick primer on getting your very own, private nation implemented in FreeCiv. Once you are done, you can play as your favorite city, sports team, state, or whatever grouping you like. Want a battle between the Romulans and the Klingons? No problem!
First, a list of the things you’ll need: