Stephen R. Berggren's 1980 Apple Nuclear Power Plant simulation, in the original Applesoft BASIC as published in Creative Computing Magazine, December 1980, as well as ports to various more, uh, modern languages.
View the Project on GitHub kevinr/apple-nuclear-power-plant-sim
The original. Not supported yet, but I do mean to set it up eventually.
Is it even possible to run Python in the browser? It has to be, right? TBD.
The only version that currently works online. Play it here.