Does anyone remember the old "gold box" TSR D&D computer games like
Pool of Radiance,
Menzoberranzan and
Eye of the Beholder.
Those games used an engine which was later adapted into a game building tool much like NWN. In fact it was the original D&D campaign builder, Throbble and I built our first adventures there before NWN came out: The Adventure Constuction Set.
Anyway, one of those wonderfully obssesive D&D enthusiasts out there is recreating the Eye of the Beholder series for NWN and the first Module is done!
It contains custom creatures and is a fairly big adventure with multiplayer support that can handle up to 4 players. (122+ MB download)
Learn more about it here:
The Eye of the Beholder Project-420