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MermaidJS is also a good alternative: https://mermaid-js.github.io/mermaid-live-editor/

GitLab has mermaid support in its markdown https://docs.gitlab.com/ee/user/markdown.html#mermaid

So does Wiki.js [1]. Pretty fancy.

[1] https://docs.requarks.io/editors/markdown#mermaid-diagrams

Mermaid became quite a common markdown feature. It is supported in a lot of places already. It can easily be integrated as it is pure client side javascript.

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