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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I don't do the mind map thing, but I do make heavy use of Obsidian as my note taking solution and it has a graph view to show the connections between nodes.
https://help.obsidian.md/Plugins/Graph+view
There are also 3rd party plugins that further build on it's system like https://github.com/lynchjames/obsidian-mind-map
Obsidian itself runs locally on top of markdown files (with it's own flavor).
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Hence, a higher number means a more popular project.