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.
surveyjs.io
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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.
For open source solutions the best bet is to use Calibre and Calibre Web ( https://github.com/janeczku/calibre-web) but they unfortunately won't have mobile apps and allow seamless syncing but you might be able to hack something together. All the best.
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