Crittersim is a simulation that runs a section of a virtual world. There are plants and animals and a semblance of natural selection and emergent behavior going on. You can control various characteristics such as the rate of plant seeding, apply herbicide and pesticide, and observe how various species compete for limited resources.
Using an advanced editing mode, you can even create your own species or modify existing ones.
This program offers you medical information and human body illustrations.
