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Outline
The fastest knowledge base for growing teams. Beautiful, realtime collaborative, feature packed, and markdown compatible.
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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're like me and uninterested in being locked into using yet another proprietary data silo you might be interested in open-source alternatives like CryptPad[1], Outline[2] and TiddlyWiki[3]. That said these alternatives don't have the whole featureset of every tool in the OP, so I periodically research alternatives too.
[1] https://github.com/xwiki-labs/cryptpad