WolframAlpha
WolframAlpha is like having a personal interactive encyclopedia. It is the web’s premier reference utility covering...
Geo Walk HD – 3D World Fact Book
*Featured by Apple on “Back to School” Explore the world through this 3-D World Fact...
Back in Time for iPhone
• Winner of the WSA Mobile Award• Top1 iPhone Book App in 10 Countries• Featured by...
Back in Time for iPad
* “The coolest history textbook you’ll find on the iPad” – The New York Times *...