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PlantUML is my favorite... but it is all texual. There is a great support for it on VSCode and Emacs for previews. I prefer VSCode to create my UML diagrams and Gantts (even though I am mainly Emacs)

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Being all textual is a feature, you can put it in your VCS for example. Just for that reason it's infinitely better than any other solution.

I strongly agree. I only mentioned "but it is texual" because it looked like that the author likes GUI-based one.

Knotend now can export to PlantUML

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