An interesting cross platform app For exploring Conway's "Game of Life" and other models of cellular automata. has many interesting features including Bill Gosper's hashing/life algorithms, guns, gliuder guns, and more.
I tried running it on my fedora 11 Linux system. Runs but get some nasty crashes when i try and access some functions. I think it has to do with one of my libraries being a bit out of date. I might try again with a slightly older version.
If anyone else tries to install/run this I'd be interested to know the results.
http://golly.sourceforge.net/