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.
surveyjs.io
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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.
Best we've come up with (but still has issues with syncing parallel edits) is Tiddlywiki
It's open source and still in its early stages. It's pretty limited, and there's no way of identifying who made what change or adding an alias (contributors are only identified by their wallet signature).
NOTE:
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Hence, a higher number means a more popular project.