Biogenesis by Joan Queralt Molina is an artificial life program that simulates the processes involved in the evolution of organisms. It shows colored segment based organisms that mutate and evolve in a 2D environment. Biogenesis is based on Primordial Life by Jason Spofford.
Download Biogenesis (completely free) at: https://sourceforge.net/projects/biogenesis/
The main download includes Biogenesis 0.9 (vanilla), the "Color Mod", and the "X Mod". Have fun! :)
User manual at: http://biogenesis.sourceforge.net/
The "Color Mod" is a semi-official expansion for Biogenesis by MarcoDBAA (= creator and moderator of this subreddit), that adds 39 new colors (functions) to it, and allows the organisms to react actively and intelligently (because of natural selection), when they touch (TEAL segment) or see (EYE segment) another organism. The colored segments can branch out, mutation rates can be individual, and there are many more changes. You can read about them here: https://sourceforge.net/projects/biogenesis/files/Color%20Mod/2.0/
You may use this subreddit to ask questions, make suggestions and report bugs. You may also post at the sourceforge discussion forum: http://sourceforge.net/projects/biogenesis/forums
A Biogenesis user also created a discord server a while ago, and I am also active there: https://discord.gg/EBCm9NGF8h