Muffin

The Cinnamon desktop’s window manager and compositor, forked from Mutter and adapted to Cinnamon’s shell and settings. It manages stacking windows, workspaces and effects; its source includes both X11 and Wayland-related backends, although Cinnamon’s Wayland session remains a distinct, evolving part of the desktop. Muffin is a fork of Mutter, specifically adapted to serve as the Cinnamon desktop’s window manager.