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https://excalidraw.com/ ?
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Obsidian might be a tool that you might find useful for non linear notetaking and it has a basic graph visualisation of linked notes.
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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.
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You might be able to hack something up with Graphviz. It is text based source code so I just use Notepad++ which you can set up with syntax highlighting and a plugin to preview the output. You can play around with this online editor.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.