There’s a few open source ... diagram. Next time you need to document the wiring of something, QElectroTech is a good option to try. It’s been around since 2008 it is under active development ...

Baldwin, Carliss Y., and Kim B. Clark. "The Architecture of Participation: Does Code Architecture Mitigate Free Riding in the Open Source Development Model?" Management Science 52, no. 7 (July 2006).