Woolah - Knockout Photo challenges with your friends.
Trivia Crack - Produced by Etermax, Trivia Crack lets players answer trivia questions and compete against other people on mobile devices.
SPAR! - Challenge your friends. Put money on the line. Get better.
QuizClash - In QuizClash, you can challenge your friends or random opponents to a game of trivia.
ShutterSpots - Find & share photo locations nearby & all over the world!
A Google a Day - Online trivia game where you use Google's search to answer questions as fast as you can.