DroidSat is a real-time satellite tracker app. Once the app is downloaded and installed on to the user’s device, they will just have to point the device towards sky for knowing the satellite present over there. But the app has to be kept open while pointing the handset on to the sky.
Bubble Level is an interesting app designed to test the level or plumb of any device. You can do this by just pressing the device against any of the four sides of your device. The app also helps in determining the angle or inclination of the surface. It has built in sound effects too to improve the user experience.