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The flowcharts are gorgeous.

Check out https://mermaidjs.github.io which is less visual in plain text but much easier to write.

PlantUML is a good alternative too and has a good jetbrains plug-in

I came cross PlantUML recently, it's so much more than a classic diagram tool. I was particularly intrigued by their wireframe system: http://plantuml.com/salt

As we use Confluence for our collective brain, awareness of this was an unexpected bonus. Thank you.

Yes they are but how to write them?

Arrived to read about a markup language, discovered something properly useful. Thank you.

Wow, genious idea.