After a few months of being saturated in a programming project, I am finally getting back to hardware. Anyway, I ran across this online cirkit designer tool that might be handy for folks that need to document system wiring. It can also be used for breadboard documentation, for anyone who needs such a thing, but I can see using it for inter-module wiring. FWIW.
An example:
https://app.cirkitdesigner.com/project/009a18bc-771a-4b1d-a69c-e629249e3f6b