Download the ruleset
The ruleset is just the default nations.ruleset, only slightly edited to get rid of Dúnedain and Mordors, and further rearranged (and shortened) to fit the small-scale maps of the world presented here. It is supposed to be used with the definitions of default nations in the data/nation directory of the standard FreeCiv installation.
The list of nations can easily be altered (if you prefer to have e.g. Hungarians instead of Czechs in your game) or expanded (if you want to have some random positions) by simple "de-commenting" the eliminated nations in the ruleset file.