Quite interesting, complex systems, cellular automata, artificial life...
Applets for Neural Networks and Artificial Life.
Vants (virtual ants) and Beasties. Very good!
The artificial life resource.
The page by David Griffeath.
The page by Pagliarini, Parisi, Lund, Miglino and Menczer.
By J. H. Conway.
By Rudy Rucker and John Walker.
Boppers, Gnarly Sampler, Kappa Tau Ribbon Space Curves, Capow...
It's incredible!
By Andy Wuenshe.
Bird flocks and fish schools by Craig Reynolds.
Links for Conway's Game of Life.
Artificial life links.
Xtoys.