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Re:Plant UML – Open-source UML Tool by the-alchemist on Thursday April 29, 2021 @09:22AM (#26980816)
Huge fan of the Javascript equivalent, although not as featureful: https://mermaid-js.github.io/mermaid/#/

Gitlab has support for it built-in, and so do many Markdown editors (https://marknoteapp.com/).

Re:Plant UML – Open-source UML Tool by jiki on Friday April 30, 2021 @04:58AM (#26991202)
Mermaid only supports horizontal and vertical layout, which makes it not capable of drawing complex graphs.