  The <a href="http://www.cs.washington.edu/research/projects/lis/chaos/www/simulator.html"> Chaos Router Simulator </a> is a powerful simulator which can simulate all sorts of networks and routing algorithms.  It includes a very nice <a href="http://www.cs.washington.edu/research/projects/lis/chaos/www/sim_mesh.gif"> graphical front end</a>!   <h3>
