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Duolingo

Location: Pittsburgh, PA

What it does: Duolingo’s free app helps users learn more than 30 languages, from Spanish to Esperanto, via game-like instruction. Users score points and execute timed challenges to ascend to new levels. It’s reportedly effective, too. A recent study found that students learned roughly as much from 34 hours of Duolingo as they did from a first-semester Spanish course.

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