Caveman2Cosmos is a CivFanatics community mod that add new features and content to the Civilization 4 experience, with almost daily updates since November 2010. It is the spiritual successor the The Civilization 4 mod Rise of Mankind and its addon A New Dawn, and combined the work of over 100+ modders to create a mod to "rule them all". It is developed by StrategyOnly Productions with its modding team made up of prominent members of CivFanatics.
A beautiful mod that complete Civilization! everything that u have expected from a civilization is here and HELL its alot of fun playing it now! it even made me throw away my civilization 5! who need that anymore?!
and ofcourse there is a BUT...
But the game crash WAY TO OFTEN! and loading times are long! both for launching the game and starting or loading a game! and together Crash+loadings make it way annoying! it make me drop the game sometimes and go play something else after crashes, but its still worth it! thats why i will give it 7/10, if they ever fix the crashes its a BIG 10!
EDIT: changed the score to 6/10 because the game start to crash almost every turn around middile of game! its almost unplayable and i saw in ur forum that many other ppls have this problem too sadly :/