calibre - Ebook manager, viewer & converter
File Manager File Explorer - File Manager File Explorer is a fully-featured file explorer and app manager to help with file transfer and accessing files and documents.
FBReader - FBReader is an e-book reader for various platforms. Features:
Solid Explorer - Solid Explorer is a powerful Android file manager featuring access to most popular cloud storages, root access and easy extensibility.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
File Commander – File Manager/Explorer - File Commander – File Manager/Explorer is a world’s leading and powerful file manager that lets you handle any file on your Android device, cloud storage or network location via the clean and intuitive interface.