"Cellular Automata Machines: A New Environment for Modeling" is one of my favorite books of all time! It shows lots of peculiarly indented Forth code.
https://donhopkins.com/home/cam-book.pdf
CAM6 Simulator Demo:
https://www.youtube.com/watch?v=LyLMHxRNuck
Forth source code for CAM-6 hardware:
Thanks for hosting those.
This isn't a CAM simulator, but I once wrote a little hack of a CA playground inspired by it. Table-driven in a similar way, user-scriptable with JS, includes neighborhoods like the Margolus neighborhood. https://github.com/darius/js-playground/blob/master/ca.js and the associated ca.html.