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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.
Other resources - Graphviz and Viz.js helped me a lot in in creating graphing app I built before I knew of these other libraries. "Graph visualization" was what I was searching for.
Node red is exactly what you are looking for. https://nodered.org/
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.