Apps similar to calibre include Readest, which is open source with a free version. Other options are KOReader, Koodo Reader, Librera Reader and Foliate. Ebook Readers like calibre are a crowded field, with more than 100 alternatives for Windows, Android, Mac, Linux and iPhone.
MyBookshelf is web based program to manage your library of ebooks. It is fully web based, with simple, yet powerful interface. It’s written in python language and django web framework offers great flexibility and extensibility. Ideal for sharing ebooks within a group of people.
Store your ebooks. Track your reading. Discover new favourites.
Goodreads meets Dropbox - your own ebook cloud library for all your digital reading.
United Kingdom
An ebook reader and library management app supporting ".epub" files. Arianna discovers your books automatically, and sorts them by categories, genres and authors.
Germany
EU
epuBear SDK is a C++ solution for EPUB readers development created by SCAND mobile app developers. It is fully compatibility with EPUB2 and partially with EPUB3. Open, unpack and parse EPUB documents from file or memory (byte array), get EPUB document info, render pages to...
Belarus
Free and simple software for removing/decrypting DRM from Kindle, Adobe Digital Editions, Barnes and Noble, Kobo, Sony, Fictionwise eReader, and other ebooks. Many tools included, including stand-alone scripts and a Calibre plugin.
Book inventory, Ebook Collection Organizer, Book Collection Manager, Book Collection Organizer:
Russia
Easy to use yet powerful application for cataloguing, organizing and managing your collections of books, comics or other kind of documents such as scientific articles, magazines and so on.
Take control of your digital library. BookHeaven is a tiny self-hosted ecosystem that helps you manage and read your e-books in a very convenient way.
SpainEU
A local-first, AI-native reading app that turns books, highlights, notes, and conversations into durable context.
As a professional eBook Converter, Any eBook Converter will decode DRM-protected Kindle & Adobe eBooks and convert them to EPUB, MOBI, PDF, AZW, TXT. Besides, you can edit the metadata of eBooks, including the title, author and publisher, etc.
Kindlian is a cool add-on for your Kindle. It's a desktop app that allows to view and manage Kindle books and collections. It works on Windows XP/Vista/7/8 and supports Kindle 3, 4, 5, Touch, and Paperwhite. A Mac OS X version is planned, but not yet available.
