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Calibre Web
:books: Web app for browsing, reading and downloading eBooks stored in a Calibre database
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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 personally don't use Highlights and Annotations, but I don't believe it syncs those at the moment. I do know its a hotly requested feature though. You can see some talk of it in this github issue: https://github.com/janeczku/calibre-web/issues/2155
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.