ANIMALS
This is a computer simulation of animal behavior that involves the "problem of action selection when dealing with realistic, animal-like situations."

Biology Labs On-Line Project
California State University's virtual lab project allows you to become familiar with scientific research techniques through several biology based simulations. Includes evolution, translation, mitochondria and hemoglobin labs. Paid subscription is required to access labs.

Morphs
Morphs is based on a program described in The Blind Watchmaker by Professor Richard Dawkins. Evolve some Morphs!

Share-A-Life
Design your own population and environment experiments. You can change variables in your population or environment and determine what effects these changes have on your artificial organisms.

Survive
How long can your neural networks survive in this artificial life game?