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I like to make these kinds of mock ups using https://asciiflow.com https://asciiflow.com. Some of the components from the article paste nicely there.

• ftr1200 8mo ago
  https://cascii.app https://cascii.app many more features :)
• ynac 8mo ago
  Monodraw is a champ as well. Stand alone and outputs to graphic or text file. Easy to feed to other people or artificial people.