KWin is described as 'Window manager for the X Window System, and is in the process of becoming a Wayland compositor. It integral part, and the default window manager of the Plasma Workspaces, but it can also be used on its own or with other desktop environments' and is a Window Manager in the os & utilities category. There are more than 50 alternatives to KWin for a variety of platforms, including Linux, Wayland, Windows, X11 and BSD apps. The best KWin alternative is niri, which is both free and Open Source. Other great apps like KWin are Compiz, VirtuaWin, awesome and Qtile.
Cage is a kiosk compositor for Wayland. A kiosk is a window manager (in the X11 world) or compositor (in the Wayland world) that is designed for a user experience wherein user interaction and activities outside the scope of the running application are prevented.
Weston is a Wayland compositor designed for correctness, reliability, predictability, and performance.
Window manager for X inspired by DWM, i3, and other tiling window managers. Windows are assigned to tags, and are automatically arranged on the screen in a stacked layout making the most of your monitor.
CLFSWM is a highly dynamic. 100% Common Lisp X11 window manager. By default there is only one frame (the root frame). Other frames are created/deleted on the fly. A window can be in more than one frame, so it can have multiple views of the same windows.
PowerResizer is a utility that provides many facilities in moving or resizing windows in a Microsoft Windows desktop environment.
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