Okay, so this app isn't "new" in the traditional sense of the word, but it's kind of new and very cool. Full!screen lets you hide the system navigation bar and notification area on your Android phone or tablet so you can use that space for apps and games in full screen mode. It's not just crashing your system UI, though. Full!screen places minimalist replacement buttons tucked away in the corners.
Full!screen has a ton of settings that allow you control every aspect of your device's navigation behavior. You can use swipe gestures, pop-out pie menus, and long-presses to access different functions.