If you’re looking to learn another language, Duolingo gamifies language learning with bite-sized lessons and a friendly interface. Starting with simple vocabulary and building from there, Duolingo is your guide to learning a new language or brushing up on one you already know. The more you use the app, the more you unlock and—with practice—the more you learn. This free app currently supports Danish, Dutch, French, German, Irish, Italian, Portuguese, Spanish, and Swedish. Or more practical choices, like Esperanto and Klingon.