Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
calibre - Ebook manager, viewer & converter
Magiclingua - Speak a new language with confidence
FBReader - FBReader is an e-book reader for various platforms. Features:
Cambly - Private language tutors on demand.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.