The xtoys package includes sources for: xising a two dimensional Ising model simulator xpotts for the two dimensional Potts model xautomalab a totalistic cellular automaton simulator xsand for the Bak, Tang, Wiesenfeld sandpile model xfires a simple forest fire automaton schrodinger a schrodinger equation simulator xwaves shows three different wave equations xtoys.tar all the files combined For some of these there is a corresponding .txt readme file. To compile after unpacking, first type "make". If this does not work, try the hints in Makefile. These all look best on a color monitor. I want these to compile under generic X; so if you have problems on any machine supporting X, I would appreciate knowing so I can fix things. The latest versions are kept at http://thy.phy.bnl.gov/www/xtoys.html Mike creutz@bnl.gov