Markdown and sometimes org-mode. For illustrations, draw.io [1] and Excalidraw [2]. [1]: https://app.diagrams.net/ https://app.diagrams.net/ [2]: https://exc

Markdown and sometimes org-mode. For illustrations, draw.io [1] and Excalidraw [2]. [1]: https://app.diagrams.net/ https://app.diagrams.net/ [2]: https://excalidraw.com/ https://excalidraw.com/