Wikipedia
LuneOS
LuneOS is a mobile operating system (OS) based on the Linux kernel and currently developed by WebOS Ports community. With a user interface based on direct manipulation, LuneOS is designed primarily for touchscreen mobile devices such as smartphones and tablet computers. The OS uses touch inputs that loosely correspond to real-world actions, like swiping, tapping, pinching, and reverse pinching to manipulate on-screen objects, and a virtual keyboard.
LuneOS is the open source successor for Palm/HP webOS where the user interface is rebuilt from scratch by using the latest technologies available (Qt 5.6.0 / QML, QtWebEngine, etc). All devices can have a LuneOS port if they have a CyanogenMod ROM available that works.