Our great sponsors
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Polar Bookshelf
Discontinued Polar is a personal knowledge repository for PDF and web content supporting incremental reading and document annotation.
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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.
Its creator planned once to make it properly selfhostable before making it kinda proprietary I think. Maybe you could ask him again about polar-bookshelf and his plans to make it fully selfhostable.
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.