The Deepin desktop is part of the Deepin distro. It’s based on HTML5 and WebKit, and uses a mix of QML and Go for its components. Besides the desktop itself, notable homebrewed Deepin components include the application launcher, dock and control centre. The Deepin desktop tries to replicate the Mac OS X, and has a clean and clutter-free interface with nothing except the dock at the bottom of the screen.
Deepin has configurable hot corners that by default enable you to access the applications menu and the control panel. From here, you can manage all aspects of the desktop including the boot manager. It isn’t yet officially supported by any other distribution, but you can fetch it via thirdparty repositories for your distribution.