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organice
An implementation of Org mode without the dependency of Emacs - built for mobile and desktop browsers
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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.
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logseq
A local-first, non-linear, outliner notebook for organizing and sharing your personal knowledge base. Use it to organize your todo list, to write your journals, or to record your unique life.
Braintool looks interesting, though so far Chromium-only. Seems like someone is working on Firefox support: https://github.com/tconfrey/BrainTool/issues/16