Our great sponsors
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koreader
An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Cervantes, Kindle, Kobo, PocketBook and Android devices
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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.
Koreader is a file manager and reading app for Kindles and other E-readers. I run it on a Kobo through OKreader (a whole open-source OS with Koreader) and it is definitely worth checking out.
I'd heartily recommend calibre-web, which allows you to upload an ebook directly via the web UI, and then converts it to .mobi, and sends it to your send-to-kindle address.