FreeCiv - (Linux, Windows, Mac) The open source game FreeCiv begins in prehistory where your mission is to lead your tribe from the stone age to the space age. This game is similar to the popular PC Civilization series created by Sid Meier. Freeciv is a turn-based multiplayer strategy game, in which each player becomes the leader of a civilization that fights to become the greatest civilization in history. Your goal is to build cities, collect resources, organize your government, and build an army. This is probably one of the most addictive and widely acclaimed open source empire-building strategy games around. The game supports three rulesets, an almost mind-numbing array of features, tweaks, and options, along with a set of unofficial options that will keep you busy for the rest of your life. The game is so popular that it's been translated into twenty-nine different languages. Freeciv supports up to 30 players and LAN/Internet play. Price: Free.