KinScreen

The app lets you pick multiple ways in which you can turn the screen on, by either waving over the proximity sensor or uncovering the sensor, if you have a flip cover. There are multiple modes for keeping the screen on, either by detected motion, tilt, angle, waving over proximity sensor or tapping a notification. You can set the app to keep the screen on while in-call or charging.
 
It comes with tools for setting the screen off after a specific amount of time has passed or after a maximum keep-on time. These options help save battery life and make sure that your phone has enough juice by the end of the day. It also has a tool for calibrating the sensor on your phone and one for keeping the screen on functions active while the device is on lockscreen.