Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.
Memrise - Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.
doopoll - Create live, instant, editable polls effortlessly
Busuu - Join the global language learning community, take language courses to practice reading, writing, listening and speaking and learn a new language. Learn English with busuu's .
Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.