Learn English on Mosalingua

Mosalingua is a language learning system that prides itself in having 11 million learners. It works by using flashcards to teach you new words and phrases. The app also includes a pronunciation guide, grammar tips, and a dictionary.
Price: Free
Devices:

Learn English on Awabe

Awabe is a flashcard language learning app on Android. It focuses on vocabulary, offering as much as 4,000 words for each language.
Price: Free
Devices: Android, iPad, and iPhone

Learn English on Bravolol

Bravolol is a series of apps like "Learn French", "Learn Japanese", or "Learn Italian" that offer a basic language learning experience.
Price: depends
Devices: Android, iPad, and iPhone

Learn English on Udemy

You can use Udemy to learn a new language. Courses such as "Learn Dutch Beginner" and "French Language Learning: Language and Culture for Absolute Beginners," will help kickstart you in those two languages.
Price: Free
Devices: Web