Duolingo : Learn any Language you want.

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Link : https://www.duolingo.com/

Duolingo is a freemium language-learning platform that includes a language-learning website and app, as well as a digital language proficiency assessment exam.

Duolingo courses include periodic advertisements which users can pay a subscription fee to remove. As of November 2016, the language-learning website and app offer 68 different language courses across 23 languages, with 22 additional courses in development. The app has about 200 million registered users across the world.