Duolingo
Duolingo, which was chosen by Apple as app of the year for 2013, makes it easy for you to learn English, German, French, Spanish, Italian and Portuguese for free. To use the app you need to log in or create an account in Google Plus or Facebook, and this feature makes it easy to continue your lessons. Once you’re logged in, you can begin the lessons in earnest, and they’re not just informative but engaging.