The best free alternative to calibre is KOReader, which is also Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to calibre and loads of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to calibre are Readest, Foliate, Librera Reader and Koodo Reader.
An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Kindle, Kobo, PocketBook, Linux and Android devices.
As an e-book reader it is unparalleled, I believe. It is not a feature-rich library management tool, though.
Readest is a modern, open-source ebook reader for Windows, macOS, Linux, iOS, Android, and the web.
Librera Reader is a highly customizable and feature-rich application for reading books in PDF, EPUB, MOBI, DjVu, FB2, TXT, RTF, AZW, AZW3, HTML, CBZ, CBR formats on Android devices.
Koodo Reader is a powerful ebook reader designed to provide a simple and easy-to-use reading experience.
cleaner and significantly better user interface and user friendly.
I use the web-based platform and it's just very good. Super intuitive and minimalistic but with great functionalities and customization. And it's FOSS.
Sigil is a multi-platform ebook editor. It is designed to edit books in ePub format.
Read book files in EPUB, PDF, DOC, DOCX, RTF, TXT, DJVU, FB2, MOBI and CHM formats. Supports chapters, bookmarks, page style. Saves the current reading position. Automatic detection and display of the list of all supported documents on your device.
Openlib is an open source app to download and read books from shadow library (Anna’s Archive). The App Has Built In Reader to Read Books.
Calibre-Web is a web app providing a clean interface for browsing, reading and downloading eBooks using an existing calibre database.
Episteme Reader is an offline-first application designed for reading various document formats. It leverages native Android technologies and C++ libraries to provide a performant reading experience with customization capabilities.
Discover a vast library of books to search, preview, and buy, read free public domain books, sync page positions, and back up purchases online for a seamless reading experience across multiple devices.
Other than being an e-book store, it also allows PDF and EPUB files to be uploaded and they become available on all devices with Google Play Books. The reader is pretty great as well.
google play books is nowhere near the same as calibre
Google Play books isn't an ePub reader. You need to buy books to use it.
Lightning fast with a slick design, Kavita is a rocket-fueled self-hosted digital library which supports a vast array of file formats. Install to start reading and share your server with your friends. book reader, self hosted, manga, comics, free, manhwa, e readers, electronic...
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A very feature-full reading app. I use it with my PocketBook Color and PocketBook InkPad Color and it is much snappier than the default reading app.