I looked around a teeny bit and there's some stuff but what you describe doesn't show up right away. This is a chemical (?) simulator that's been around since

I looked around a teeny bit and there's some stuff but what you describe doesn't show up right away. This is a chemical (?) simulator that's been around since 1993 I believe: https://www.wur.nl/en/product/Simulator-of-Human-Intestinal-Microbial-Ecosystem-SHIME.htm https://www.wur.nl/en/product/Simulator-of-Human-Intestinal-... I also found this numeric simulator: https://learn.genetics.utah.edu/content/microbiome/simulator/ https://learn.genetics.utah.edu/content/microbiome/simulator... but I can't view the content right now.