About mutter
Mutter is a window and compositing manager that displays and manages
your desktop via OpenGL. Mutter combines a sophisticated display
engine using the Clutter toolkit with solid window-management logic
inherited from the Metacity window manager.
While Mutter can be used
About GNOME Shell
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GNOME Shell provides core user interface functions for the GNOME 3
desktop, like switching to windows and launching applications. GNOME
Shell takes advantage of the capabilities of modern graphics hardware
and introduces innovative user interface concepts to pro
