Daily Curiosity for iOS - The top 5 things to learn on Curiosity.com, delivered daily.
GitHub Visualizer - Enter user/repo and see the project visually
Endless - Random and amazing Wikipedia articles.
CodeFlower - CodeFlower visualizes source code repositories using an interactive tree.
Corbie - Expand your general knowledge in just 5 minutes a day
Gource - Gource is a software version control visualization tool.