Duolingo
Duolingo is a language-learning and crowd sourced text translation platform. The service is designed so that, as users progress through the lessons, they simultaneously help to translate websites and other documents. Duolingo provides Latin American Spanish, French, German, Brazilian Portuguese, Italian, Dutch, Irish, Danish,Swedish and Turkish courses for English speakers, as well as American English for Spanish, French, German, Portuguese, Italian, Greek, Dutch, Russian, Polish, Turkish, Hungarian, Romanian, Japanese, Hindi, Indonesian, Korean, Vietnamese, and Czech speakers.