Alternatives to Koobits for all platforms with any license

calibre

Calibre is a free and open source e-book library management application made by users, for users. Many languages, designed around the concept of the logical book, i.e....

Free Open Source Mac Windows Linux BSD
Batch conversion Built-in e-Book converter Book organization Built-in viewer ... Customizable E-book management Library management Book manager Custom cover image Indexed search Edit metadata Plugins Portable Rss to Kindle Supports All Ebooks Format Auto update Bibliography generator Built-in editor Built-in Adobe Flash Player Built-in PDF converter DRM Free Email notifications Facebook integration File-sync Handwritten Notes Integrated PDF Viewer Live Push Notifications Live updating Multiple languages Read fb2 format Book search SMS Reminders Sync with e-reader Update notifier Add a feature

1145 Like
Google Play Books

Google Play Books lets you search, preview, and buy millions of books using Google Book Search. Books in the public domain and certain copyrighted books can be read and...

Freemium Web Android iPhone Chrome OS Android Tablet ... iPad
Built-in translation Catalog File Searching Library ... Book search Add a feature

131 Like
Document Viewer

Document Viewer is a highly customizable document viewer for Android, fork of the last GPL version of EBookDroid . Supports the...

Free Open Source Android Android Tablet F-Droid
Customizable Add a feature

38 Like
Foliate

A simple and modern GTK eBook viewer, built with GJS and Epub.js. Features View EPUB files Two-page view and scrolled view Customize font and line-spacing Light...

Free Open Source Linux
Built-in dictionary Export annotations Manage bookmarks Plain text flows ... Text annotation Text Highlighting Night mode/Dark Theme Add a feature

19 Like
ReadEra

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....

Free Android
Auto fetch album covers Fullscreen support Material design Night mode/Dark Theme Add a feature

19 Like
Apple Books

Store and library for countless books and audiobooks on iPhone, iPad, iPod touch, and Apple Watch.

Free Mac iPhone iPad
Android Sync Built-in Commenting System Free books Library management ... Text Highlighting Add a feature

87 Like
EPUBReader

EPUBReader is a Firefox addon which lets you read ePub-files just in the browser. You don't need to install additional software! If you click on a link to an...

Free Mac Windows Linux Chrome Firefox
Export to PDF Add a feature

35 Like
Aldiko

Aldiko is an e-book reader application for the Android operating system. It supports the EPUB industry standard format for digital publications and incorporates...
- Discontinued
  The official website is no longer available. Last version, 3.1.3, released in October 2018, can be still downloaded from the Google Play Store.
Freemium $ $ $ Android Android Tablet
Offline Reading Add a feature

54 Like
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Calibre Web

Calibre Web is a web app providing a clean interface for browsing, reading and downloading eBooks using an existing Calibre database.

Free Open Source Self-Hosted
OPDS Server Built-in e-Book converter Add a feature

10 Like
Alfa eBooks Manager

The most powerful and easy-to-use Book Organizer Alfa Ebooks Manager is a free program that allows to organize your electronic and paper books in single e-Library.

Freemium Windows
No features added Add a feature

11 Like