2022 update: This article has been trimmed somewhat, after some good feedback in the comments! What if….there was a decent, free, offline diagramming tool, that saves in a sensible text-based format (SVG), with an accompanying command-line interface, so you can easily generate bitmaps for sharing, unattended. Well, I finally discovered it. It’s diagrams.net (formerly draw.io)! I’d heard about the
![How I use draw.io at the command line](https://cdn-ak-scissors.b.st-hatena.com/image/square/1e88077052c7a6e7601531a80708b03c636f1b6d/height=288;version=1;width=512/https%3A%2F%2Ftomd.xyz%2Fassets%2Fimg%2Fdrawio-header.jpg)