DuoLingo – Learn a Language for Free Forever
https://www.duolingo.com/

Learning with Duolingo is fun and addictive. Earn points for correct answers, race against the clock, and level up. Their bite-sized lessons are effective, and they have a study to prove it. Each lesson includes a variety of speaking, listening, translation, and multiple choice challenges. Instantly see which answers you get correct. When you miss a challenge, we’ll quickly show you how to improve. Duolingo motivates you to stay on track by recording how many days in a row you spend learning a language. Hearts keep your lessons alive! You lose them when you answer incorrectly. When you’re out of hearts, start over and try again. Make your breaks and commutes more productive with our iPhone and Android apps. Download them and see why Apple and Google gave us their highest accolades. This will be added to Tutorial Resources Subject Tracer™.