Wikiverse - An interactive galaxy of Wikipedia knowledge ✨
DragonBox Numbers - Teach kids about numbers with an easy and fun game
Qwiki - Find and Read Articles on Wikipedia from your Mac menu bar!
Wikids - An encyclopedia that talks to your kids
Daily Curiosity for iOS - The top 5 things to learn on Curiosity.com, delivered daily.
Four Seconds - A timer and a simple rule: stop it at exactly four seconds.