calibre - Ebook manager, viewer & converter
Librera Reader - Librera Reader for Android
Foliate - A simple and modern eBook viewer.
FBReader - FBReader is an e-book reader for various platforms. Features:
BookReader - FLOSS book reader with a simple UI.
Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...