Check out the Khan Academy API.
Khan Academy API
Education
University Domains and Names Data List API
Check out the University Domains and Names Data List API.
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Voicecup Pronunciation Dictionary API
Check out the Voicecup Pronunciation Dictionary API.
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Litmos API
Check out the Litmos API.
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Cambridge Dictionaries Online API
Check out the Cambridge Dictionaries Online API.
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British Museum API
Check out the British Museum API.
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Tracktest English Test API
Check out the Tracktest English Test API.
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Quizlet Flashcards API
Check out the Quizlet Flashcards API.
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It Bookstore API
Check out the It Bookstore API.