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wikiHow - wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual.
QuizUp - QuizUp gives you the opportunity to test your trivia skills against friends and strangers throughout the world.
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.
A Google a Day - Online trivia game where you use Google's search to answer questions as fast as you can.
AllAnswered - Your Team's Collective Brain All-In-One Knowledge Management System Wiki + Q&A + Workflow + AI
Trivia Crack Kingdoms - The amazing quiz game that lets you test your knowledge and challenge your friends to see who is the smartest. Developed by Etermax