Sid Meier's Civilization is one of the milestones in the computer game histroy. The goal of the game is to become either the ruler of the world or the first to reach Alpha Centauri.

For more information about Civ, check its website Civilization III

FreeCiv, a free software under the GNU General Public License, is generally comparable with Civilization II, which is published by Microprose. You can freely play it on your Windows or GNU/Linux box.