1. Duolingo
Duolingo works to add interactivity and customized lesson planning to the language learning experience by rewarding users when they achieve goals, giving incentive to return for more lessons -- something your high school's Intermediate Spanish course never did.
Duolingo gives users the opportunity to learn English, Spanish, French, German, Italian and Portuguese. You don't have to worry about being charged for the service any time soon, either. Co-creator Luis von Ahn told USA Today, "We're fundamentalists...
