Colorful images and Java movies of Cellular Automata, with recipes to explain their genesis. Also some tasty Real Recipes. By David Griffeath. http://psoup.math.wisc.edu/kitchen.html
An extendable DOS/Windows application for exploring cellular automata, accompanied by a thorough user guide; by Rudy Rucker and John Walker. http://www.fourmilab.ch/cellab/
Development and research of evolving cellular automata with genetic algorithms, computational mechanics, population dynamics and coevolution. http://www.santafe.edu/~evca/
A cellular automata tutorial that covers the structure, behaviour and some applications of CA and offers a philosophical background as well; by Alexander Schatten. http://www.ifs.tuwien.ac.at/~aschatt/info/ca/ca.html