Simulations

ANIMALS http://www.cs.cmu.edu/afs/cs.cmu.edu/project/ai-repository/ai/areas/agents/animals/0.html
This is a computer simulation of animal behavior that involves the "problem of action selection when dealing with realistic, animal-like situations."

Biotopia II http://www.alife.org/
"Biotopia simulates a Darwinistic ecosystem. Artificial lifeforms navigate through a sea of food and "life cells" used for reproduction."

Floys http://www.aridolan.com/JavaFloys.html
"Floys are social, territorial artificial life creatures, implemented in Java."