As researchers in multi-agent systems, we hope to build, deploy, and most importantly evaluate multi-agent systems in real, open environments. Unfortunately, working in such environments usually implies we expend significant energy on resolving issues orthogonal to the initial goals of the research, such as dealing with the knowledge engineering and low-level system integration issues. To avoid such overhead many researchers choose to implement, test and evaluate their multi-agent systems in a simulated world. In addition to providing a better-defined and predictable debugging environment, a good simulator can also help evaluate and quantify aspects of multi-agent system and multi-agent coordination in a controlled environment through repeated experiments.