Math Ref Free is a free version of the great math reference application, Math Ref. This app gives you just a sample (over 600) of the many (over 1,300) helpful formulas, figures, tips, and examples that are included in the full version of Math Ref. So, if you are a student, teacher, or need math for work and want to try before you buy, this app is for you
SkySafari 3 - SkySafari is a chart star app for all astronomy enthusiasts. It includes a comprehensive database of 120,000 stars and 220 of the most known star clusters, nebulae and galaxies.
In addition, the application displays the Solar System's planets along with their moons, as well as the most important asteroids and comets
World War II Interactive - Reading a traditional book does not do justice to World War II. A rich interactive experience with text, audio, video and photos is required, which this application will give you.
Read about the major battles and events of WW2 in detail. Swipe through the timelines for every month of the war. Watch rare video clips. Listen to famous speeches
SkySafari 3 Plus - SkySafari Plus is a chart star app for all astronomy enthusiasts. It includes a comprehensive database of 2.5 million stars and 31,000 deep sky objects.
In addition, the application displays the Solar System's planets along with their moons, as well as 4,000 asteroids, comets and satellites
Quora - The new iPhone application from Quora -- the company that Wired Magazine calls "a potential revolution in knowledge." Like Wikipedia, Quora provides great answers on a wide range of topics -- technology, movies, music, travel, health, law and much more