Documents by Readdle - A central hub for all your files.
calibre - Ebook manager, viewer & converter
GoodReader - With GoodReader on your iPhone, iPod Touch or iPad, you can read virtually anything, anywhere.
FBReader - FBReader is an e-book reader for various platforms. Features:
OPlayer HD - OPlayer HD offers you a chance to play your videos and live streams as you like and directly transform your file in any format without any discontinuity.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.