Almost forgot - Lisp In Life. Pretty sure I first saw it here at HN. IMO the most amazing part is the Life-based processor - once you have that, the rest is "merely" a matter of adding layers. But it's one thing to know someone could do it, quite another to see it in action.

https://github.com/woodrush/lisp-in-life

Run it in your browser here. Definitely worth zooming all the way in to get a sense of scale.

https://woodrush.github.io/lisp-in-life/