Kahoot - A game-based learning platform that makes it easy to create, share and play learning games or trivia quizzes in minutes.

GimKit - A classroom game-show platform where students compete by answering questions on their electronic devices.

Formative - Helps teachers unlock additional superpowers, improve student engagement and accelerate learning.

Quizalize - Engage your class with fun, standards-tagged quizzes.  Get instant data on student mastery.  Automatically differentiated follow-up activities.

Quizlet - Free website providing learning tools for student, including flashcards, study and game modes

Quizizz - A learning platform that offers multiple tools to make a classroom fun, interactive and engaging.  As a teacher, you can create lessons, conduct formative assessments, assign homework, and have other interactions with your students (for all grades) in a captivating way.