Freeciv

Freeciv is a multiplayer, turn-based strategy game for workstations and personal computers inspired by the commercial proprietary Sid Meier's Civilization series. The latest stable version of Freeciv is 2.1.6, released on August 11, 2008. The game's default settings are closest to Civilization II, both in gameplay and graphics (including the units and the isometric grid).

Freeciv is available for most desktop Linux distributions. Released under the GNU General Public License, Freeciv is free software.