Ok i will try ...
Caveman to Cosmos is a "Civilization 4 - Beyond the Sword" mod which has the philosophy is "more is more", and we take this to the limit. We have 9 eras, which span from the Prehistoric Era to the Galactic Era. We have
tons of techs which cover not only military and scientific techs but cultural and social techs. We have currently 13 different civics ranging from Military and Economy to Education and Language.
We have a very active team of about 5 to 7 modders who each bring a different aspect to the game. Our updates are fast and frequent due to SVN collaboration. Its an ever growing and evolving game that despite having more than any Civ 4 mod out there we have actually improved efficiency thanks to our master modders. They also have a feature that allow compatibility between older versions. This means you can keep playing your game even when you have updated.
Its very hard to list all the things in the mod but here are some new things i think are cool ...
1.
Dynamic Culture - Based on your starting civ and terrain you find yourself in determines what type of civ you will become. Just because you picked Rome doesn't mean you will stay as Romans. You could just as esily evolve into the Greeks or Spanish or even bonus civs you cannot start as.
2.
Goods System - A huge interlocked systems of goods that are depending upon what resources you have and what you build. For instance Wheat (Grain) -> Wind Mill (Flour) -> Bakery (Bread). There are also bonus resources where if ou have 2 types of resources near your city you can unlock new ones such as Banana + Sugar = Pineapple.
3.
Revolutions - You must not only fight outside threats but help kep your empire from splintering into smaller nations. An old but good mod feature.
4.
Prehistoric Era - You start out with nothing and work your way up. Resources are hidden until you can reveal them. You can actually hunt animals and either use them for food or to make special buildings. Fight neanderthals or ally them. You can only build one city at first but as you unlock different civics you can build more cities. Or just take over enemy cities yourself and gain not only more cities but assimilate their culture and shape your civilization's identity.
5.
Alternate Timeline - If you build the right wonders and research the right techs you can unlock secret units and buildings such as Mammoth Riders or Steampunk themed vehicles. While not every game will have these they are there to give a little special flavor to a game.
I think I rambled on too much. I am sure I forgot like 90% of the features but i hope this wets your appetite for this mod. Let me know if you have any questions.