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  Kahoot

  Kahoot! is a free game-based learning platform that makes it fun to learn – any subject, in any language, on any device, for all ages!
  http://www.getkahoot.com

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  FlipQuiz

  FlipQuiz™
  http://www.flipquiz.me

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  Quizlet

  We make simple learning tools that let you study anything, for free.
  http://www.quizlet.com

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  Socrative

  http://www.socrative.com

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  Quizizz

  Fun Multiplayer Classroom Quizzes
  http://www.quizizz.com

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  Mentimeter

  Interact with your audience - Free audience response system without registration!
  http://www.mentimeter.com

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  Tricider

  Collect ideas and vote. Free online tool for easy brainstorming and voting. For decision making, crowdsourcing and idea generation.
  http://www.tricider.com