Introduction
The app utilizes amazing Xposed framework coded by recognized developer rovo89 which, briefly, provides interface for injecting code into any app, including system services, allowing modifications of applications and system services at run-time. One of the biggest advantages of GravityBox is that it is not bound to any specific device. Actually, it should run on any device having vanilla Android 7 (ROM close enough to AOSP).
This project wouldn't be possible without rovo's Xposed framework, so huge kudos to him.
Support Developer:
https://play.google.com/store/apps/details?id=com.ceco.gravitybox.unlocker
Feature highlight
--- Lockscreen tweaks
--- QuickSettings tile management with additional tiles
--- Statusbar tweaks
--- Navigation bar tweaks
--- Pie controls
--- Power tweaks
--- Display tweaks
--- Phone tweaks
--- Media tweaks
--- Hardware/navigation key actions
--- GravityBox Actions - interface for 3rd party apps
--- Notification control (per-app notification LED/sounds/vibrations)
--- Fingerprint launcher
... and many more