[sitkack]

FWIW, Autocad, being written in Lisp, had a repl that was fed via the UI, so that you could basically see what the UI was generating and write your own scripts based off that.

I haven't used Autocad in 25 years, so I don't know how much of this is still true.

[galfarragem]

Autocad still allows all of that, and, in my opinion, a lot of its success is derived from that. Even Autocad clones have a Lisp repl.