Daily Curiosity for iOS - The top 5 things to learn on Curiosity.com, delivered daily.
SyntaxDB - Easily look up programming syntax for multiple languages
Endless - Random and amazing Wikipedia articles.
Learn X in Y minutes - LearnXinYminutes isn’t a good way to learn your first programming language, but it’s a great way to...
Corbie - Expand your general knowledge in just 5 minutes a day
GitHub Visualizer - Enter user/repo and see the project visually