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Woolah - Knockout Photo challenges with your friends.
Challenged - Create and participate in video challenges of any kind.
QuizUp - QuizUp gives you the opportunity to test your trivia skills against friends and strangers throughout the world.
myOpenLab - MyOpenLab is a platform for finished elements (program components) that can be linked together.
2016 Photo Challenge - Take a photo every day for 366 days
Znapin - Create fun memories with image & video based challenges