Unofficial games

Several unofficial games have been inspired by the Civilization series.

The most notable ones are probably C-evo, Freeciv, and FreeCol. The first two resemble Civilization II, while FreeCol is a remake of the original Sid Meier's Colonization. All three are free to download and play, and there are some options for two or more human players to compete. There is no sign that the developers plan to stop making improvements.

The term "unofficial" should probably include the commercial game Call to Power II, because it was produced without any license from any company associated with Sid Meier after the producer had had a license to produce one game (Civilization: Call to Power) using the name.

Civilization Series
Game	Expansion packs
Civilization	None
Civ II	Conflicts in Civilization Fantastic Worlds Test of Time
Civ III	Play the World Conquests
Civ IV	Warlords Beyond the Sword Colonization (Total conversion)
Civ V	Gods & Kings Brave New World
Beyond Earth	Rising Tide
Civ VI	Rise and Fall Gathering Storm New Frontier Pass Leader Pass
Civ VII
Official Spinoffs	Sid Meier's Colonization Sid Meier's Alpha Centauri Alien Crossfire Civilization Revolution CivWorld Civilization Revolution 2 Sid Meier's Starships Civilization: Eras & Allies
Other Games	Pirates! Railroad Tycoon XCOM (IP) Freeciv Imperialism C-evo Civilization: Call to Power Call to Power II FreeCol Pirates!: Live the Life CivCity: Rome Railroads! NewCol Unciv Humankind
Comparisons	Comparison between Civilization games Civilizations Glossary of Civilization terms