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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.
If you understand the underlying mechanism and are willing to work more low level, then this rtree package is about x50 faster in my experience:
https://github.com/tidwall/rtree.c
There are python bindings for it (with absolutely no documentation) here:
https://pypi.org/project/rtreecpy/
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.