RNetLogo - A package for running NetLogo from R23 Jan 2012 NetLogo R
NetLogo is software is a “multi-agent programmable modeling environment”. NetLogo can be used in individual- and agent-based modeling, and is used in the book Agent-based and Individual-based Modeling: A Practical Introduction by Railsback & Grimm.
I have not tried the package yet, but looks interesting. I am always a fan of running stand-alone programs from R if possible.