Katherine, here are the URLs for Gatekeeper:
http://www.mud-master.com/gatekeeper/index.html
and Character Control, which allows you to use playable creatures:
http://www.3ddownloads.com/?director.../util_players/
from the list of files at the above location you want:
bg_ed149.zip
Character Control - Baldur's Gate v1.4.
Both applications are very user-friendly, intuitive to use, etc. If you have any questions about how to use them just post.