Civilization IV

Of interest

Totestra, a random map generator for Civilization 4, based on Cephalo's excellent PerfectWorld map script.
Arabia, my bug fixes and map scripts for the Legends of Ancient Arabia Civilization 4 mod.
SandBar, a random map generator geared for "lots of desert" mods (like Ancient Arabia), but compatible with both stock Civ4 and a number of mods. Based on Cephalo's excellent PerfectWorld map script.
I have a reference for the API for making map scripts.
How to make a huge map with Totestra

The files here:

Totestra.py. This is the file you want to download. This was last updated in July of 2018.
Files with '-' in their filename will not be seen by Civ IV. If you wish to download an earlier release, rename the file so Civ4 can see it.
The file ServiceTag.txt describes the binary format of the service tag (which is a hexadecimal number).
The directory Caulixtla has some files of interest.
.diff files (in the Totestra directory) compare a version of Totestra with its previous version. This is a standard UNIX format: Lines that begin with '-' are deleted when going from one version to the next; lines beginning with '+' are added.