Lithium: EPUB Reader - Lithium: EPUB Reader app allows users to read their favorite eBooks after importing it from the internal storage.
Wondershare PDFelement - All-in-one PDF editor
LibriVox Audio Books Supporter - LibriVox Audio Books Supporter app comes up with an extensive collection of audiobooks through which you can search for your favorite book and listen to it in your native language right at your fingertips.
Foxit PhantomPDF - Edit PDF files with our feature-rich PDF Editor. Download Foxit PDF Editor to convert, sign, scan / OCR & more. A speedy PDF Editor alternative to Adobe Acrobat.
FLOOX - FLOOX app allows you to select a book from the internal storage to listen to it in the audio version by selecting the desired text-to-speech settings.
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.