I put together a Windows build of Paul Callahan's "gencols" program. It can be downloaded at <http://entropymine.com/jason/life/genco ... s-1.00.zip>.
(Gencols is a search program that enumerates collisions between Life patterns, to find collisions that have certain properties.)
Be warned that this is still a command-line utility, not a friendly GUI application. It's not the easiest thing to figure out how to use.