wnr - Better than pomodoro, this timer app balances work and rest.

Trivia Crack - Produced by Etermax, Trivia Crack lets players answer trivia questions and compete against other people on mobile devices.

Hourglass - Hourglass is the most advanced simple countdown timer for Windows.

QuizClash - In QuizClash, you can challenge your friends or random opponents to a game of trivia.

Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows

QuizUp - QuizUp gives you the opportunity to test your trivia skills against friends and strangers throughout the world.