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I enjoy using Mermaid: https://mermaidjs.github.io

It does not support all the diagrams yet, but it's completely themable and you can code away your diagrams like you would with dot/graphviz.

It integrates well into any Markdown tool, Gitlab integrated it about a year ago so it's natively available in Gitlab flavored Markdow.

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Any comparisons of Mermaid vs other tools? Why do you like Mermaid?

I use Plantuml myself and I find that I regularly have to fight with the layout engine to get diagrams to looks the way I want them too.

Mermaid is a bit nicer than PlantUML in that it isn't a Java blob that spits out PNGs. Easier to integrate into web things. Also the default style is much nicer.

But I think PlantUML is more capable.

I've been using mermaid for almost 2 years now, great software and still improving. It's nice too that I can keep the code in a note and change in in meetings.

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