Enter any city in the world and see the weather.
I built this little application with the following programming
tools for Android
1) Google Weather API
2) Spring for Android
I think is very useful tool for everyone and it's free.

This (USA) United States Capital Cities Flashcards App is a fun and easy-to-use tool for learning the names of the capital cities for each of 50 United States of America. The sliding flashcards have a colorful detailed map for each of the 50 states. Tapping a flashcard will reveal the card image to reveal the name of the capital city. It is an excellent tool to use by the individual student or for an entire class.