Future oriented mod for Civ IV BtS 3.17, requires all official mods and can only be played in English. Now about 185 mb zipped, over 350 mb unzipped. Civilizations have been improved over earlier versions with many added leaderheads, later eras have futuristic music. Included map scripts can create a variety of types of planets and solar systems.
Much earlier version is here
Discussion and patches at http://forums.civfanatics.com/showthread.php?t=313196