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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.
I have been using Trilium for the past few months to create a personal knowledge base. The software lacks research tools (bibliography management á la Zotero) and there are no native options for collaboration, content reuse, or annotation, but it works well for my purposes and the graphing functionality is very useful for visualizing links.
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.