After many years of development and a multitude of beta builds, the latest open source colonization "FreeCol" 1.0 is now available for download. Based on Sid Meier’s Colonization (Microprose) in which the player manages the cross-Atlantic expansion of an established nation in the service of the Crown, this is an open source version which is also very similar to Civilization. Starting off with

Source and More information: FreeCol – Open source colonization hits its first big release! (Requires Java)