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.
Frankly, the Most Ambitious version of Civilization I've ever seen!!
Trust me, it has to be that good to keep my attention for so long.
Completely blown away by the care of the community and depth of gameplay shown in this mod. C2C redefines CIV so much that it has the momentum to set a much higher bar for Civ 6. It's already so close ; it could inspire Civ 7! You have to check out the forums and play it for more than a game or 2. It radically evolves monthly!!