Mutter is a Wayland display server and X11 window manager and compositor library. It contains functionality related to, among other things, window management, window compositing, focus tracking, workspace management, keybindings and monitor configuration.

Internally it uses a fork of Cogl, a hardware acceleration abstraction library used to simplify usage of OpenGL pipelines, as well as a fork of Clutter, a scene graph and user interface toolkit.

This package contains the mutter executable. It can be used as a standalone window manager, but is primarily intended for debugging.