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Mermaid (https://mermaid-js.github.io/) is excellent, easy to embed inline in Markdown or reStructuredText and to version with the rest of the documentation.

I've been using Mermaid for years. Works great

Returning 404; seems the index.html is missing; direct link:

https://mermaid-js.github.io/mermaid/

ditaa[1] for ascii art, Graphviz[2] for node-and-edge stuff, PlantUML for the rest

[1] http://ditaa.sourceforge.net/

[2] https://graphviz.org/

Use graphviz as well. That look very verbose. Btw learn graphviz via the lisp one game at a time.

Land of Lisp? I don't remember if that's how I came across graphviz, but it was my introduction to generating svg.

I really like mscgen[1], partly because the syntax is very GraphViz-like, which feels familiar.

[1]: http://www.mcternan.me.uk/mscgen/

I use this https://www.websequencediagrams.com/ a lot