QuizClash - In QuizClash, you can challenge your friends or random opponents to a game of trivia.
GoodUI Evidence - People's A/B test results that show which UI ideas work best
Trivia Crack - Produced by Etermax, Trivia Crack lets players answer trivia questions and compete against other people on mobile devices.
Decidr - Make better decisions with quick A/B polls
A Google a Day - Online trivia game where you use Google's search to answer questions as fast as you can.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.