http://www.mobotsim.com/
http://www.cyberbotics.com/webots/
http://www.daimi.au.dk/~repsej/thesis.html
http://www.ini.unizh.ch/~thomas/netmaze/
http://rossum.sourceforge.net/sim.html
http://rossum.sourceforge.net/downloads.html#x3
http://ai.about.com/library/robots/ucrobot02.htm
http://www-robotics.cs.umass.edu/rirp/software.html
http://www.amigobot.com/amigo/sim.html
http://cswww.essex.ac.uk/Research/tuuv/simulators.html