Backdrops - The only wallpapers you'll ever need. Say hello to Backdrops.
calibre - Ebook manager, viewer & converter
Pitch Black Wallpaper - Pitch Black Wallpaper is an application, allowing you to set the pitch-black wallpaper to your smartphone or tablet.
FBReader - FBReader is an e-book reader for various platforms. Features:
WallpapersCraft - HD & 4K wallpapers
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.