As of the last official edition of the game (version 2.5), there are a total of 555 nations, or rulesets, that define the different civilizations available to play. All of them are identical, except for their specific city-lists and their respective flags. For the corresponding flags (incl. pending patches) see a Flags Catalog on the Freeciv wiki. This list includes a number of imaginary nations (like werewolves or vampires) among the real ones, but they work the same as the others. All the nations have predefined names for their leaders too, but the game offers the option to customize it.