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.
Drops - Visual language learning.
MindSnacks - *** One of the best educational apps of the year - Apple (iTunes Rewind) ***
Vocabulary Miner - Flashcard app with offline learning, spaced repetition, no ads, export & import, statistics...
Rosetta Stone - Rosetta Stone is the world's most popular software for learning languages. It is offered at a cost of just $169 when purchased outright, but it is also possible to purchase language programs in a subscription format that offers ongoing support.
Learn to speak English grammar - Learn to speak English grammar is an app that allows you to learn the English language and understand or speak it as your native language.