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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.
This might not be the answer, but TiddlyWiki (https://tiddlywiki.com/) is a free open source notetaking app that is like a mini-database of notecards you create, all in one downloadable web file that you can use in any browser on any platform. I created a popular adaptation of TiddlyWiki called Stroll (https://giffmex.org/stroll/stroll.html).
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.