Free App for Android users, Shake Pro (Got 4.3 score)
Here is the coolest App I have ever found and it's currently offered for absolutely free! Play Google gives Shake Pro for free to all Android users. You can make a call or do some actions like run application of Gmail, Facebook or turn on music player even the flashlight by just simply shaking your phone (hence, the name). You can also replace your ringer mode and turn on or off GPS by also just shaking your device. You don't have to turn on your screen just to do all these stuff and more! Enabling the "Active when screen is off" will consume more of your battery while enabling the 'battery saving mode' will consume minimum of it. You can check their website for more of the App features. Now, act fast to get the coolest App for free.