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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.
As long as you're not specifically looking for something online, both Fantasia Archive and World Maker are downloadable, free, open source projects (though the second is still an early version). If you're also not looking for something specifically designed for worldbuilding, Obsidian is a decent free (for personal use) desktop wiki.
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.