Tweedle App - Notion is nice but sometimes all you need is an app like Tweedle.

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

Plume - App for writing documents, scripts, books and more.

A Google a Day - Online trivia game where you use Google's search to answer questions as fast as you can.

Tweetbot - Sync your timeline across your iPhone, iPad, and Mac. Mute tweets by user, hashtag, tweet source, or keywords (including regex). 3rd Party support for image, video, read later, and timeline sync services.

Trivia Crack Kingdoms - The amazing quiz game that lets you test your knowledge and challenge your friends to see who is the smartest. Developed by Etermax