Learn JavaScript - Learn JavaScript with guided tests and flashcards

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

JavaScript.com - A free resource for learning and developing in JavaScript

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

The Ultimate SaaS Quiz - Challenge your friends and improve your SaaS knowledge

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