[achamayou]

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.

[guiambros]

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

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

[mrits]

I've been using Mermaid for years. Works great