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Re:Show HN: I made a mind map tool meant for large, detailed... by zawerf on Saturday September 07, 2019 @02:53PM (#20905756)
https://gingkoapp.com/ is another similar app.

Like some of the other commenters in the thread, I gave up on these apps and went back to using filesystem folders/files.

Re:Show HN: I made a mind map tool meant for large, detailed... by Terretta on Saturday September 07, 2019 @10:36PM (#20908248)
The editor Ulysses supports markdown, but more relevantly, supports folder/file structure such that trees of hierarchy can be selected at once to become part of a same generated master document.

https://ulysses.app/tutorials/split-merge-glue

(You can also just select and then export, which does a temporary glue, more or less.)