Fiat
Fiat is a more-or-less direct translation of the randomized alternate world-building procedure laid out in GURPS Infinite Worlds.
All probabilities, descriptions, and names are from there, with a few trivial exceptions. It supports deeper per-country attributes to some extent, but they're not used or filled out yet.
I've put the project on hold, first after trying to implement map support, and eventually to construct a true historical simulator instead.