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

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

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

Akinator - Akinator is an entertainment app that acts like a digital genie that can read your mind. The game will ask you a few questions about the character you have chosen, and it will attempt to guess the character from your provided answers.