Civilization IV: Beyond the Sword mods

I've appreciated a good mod ever since downloading Counter-Strike via dial-up back in 2000, but a steady paycheck lead to decreasing mod usage over the years. It was quite the pleasant surprise when I recently discovered that my favorite expansion for my favorite computer game, Civ IV: Beyond the Sword, shipped with a number of mods. Some notable ones were a winter-setting fantasy world, post-apocalyptic tactical scenario, and a Mesoamerican setting. Being a fan of Aztec history, I have a feeling that I'll be spending some quality time with the final mod, although possibly not until after Steam Con this weekend.