iA Writer - Minimal Design, Maximum Focus

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

MacDown - MacDown is an open source Markdown editor for OS X, released under the MIT License.

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

exegesis - A writing app for disorganized, creative, nonlinear thinking

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