calibre - Ebook manager, viewer & converter
Data Crow - Data Crow is the ultimate media cataloger and media organiser.
Adobe Digital Editions - ebook reader software
Bluefire - Bluefire Reader is your go-to reading application for ePub and PDF content, including ebooks from...
Tellico - Tellico is a KDE application for organizing your collections.
Universal Book Reader - Just like its name, Universal Book Reader is really a universal book reading application allowing you to read the eBooks from the convenience of your smartphones.