[newcup]

I've been recently using pic to draw any kind of images for documentation purposes.

Pic is a language Brian Kernighan created for troff toolchain. It's very versatile and has macros, even! Manual: https://pikchr.org/home/uv/pic.pdf

Contemporary implementations (pic2plot, dpic, pikchr) can output SVG so the results look very nice and are repository-friendly and diff-friendly to some extent.

I've bolted it to Emacs for "interactive" editing: https://iki.fi/newcup/cons-trained/2021-02-03-neat,-simple-v...