Anki - Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.

Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.

Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.

doopoll - Create live, instant, editable polls effortlessly

Memrise - Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.

Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.