EcoSystem
A small artificial life system with a single species of evolving entities. While the population of the system is limited to around 250 individuals, each of these may will have one of the 3 quadrillion possible personality combinations.
It was programmed in Turbo Pascal 7.0 during 2006, but on a fairly dated computer (300MHz processor, 32MB RAM). It runs acceptably under DosBox, but requires Turbo Pascal 7.0 to edit any parameters.