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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.
"Briefkasten": https://github.com/ndom91/briefkasten
floccus https://floccus.org/
I'm using LinkAce and can recommend it. No Browser Add-on needed, you can add bookmarks with a Bookmarklet flawlessly.
I have updated my initial comment. You can find the tools [here](https://github.com/spaytac/LinkdingTools)
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.