Marcus Hutchings updated his Apocalypse Bot project:
"The goal of this project is to produce a modification for Hexen II that allows users to include simulated players in their networked games. These artificially intelligent players try to behave like real players, performing tasks such as collecting and using items, exploring their environment, and flee from and pursue enemies."
Interested? Just take a look at his website Doomwolf: Apocalypse for more details and downloads.