Skippy-XD is described as 'Full-screen task-switcher for X11. You know that thing Mac OS X, Compiz and KWin do where you press a hotkey and suddenly you see miniature versions of all your windows at once? Skippy-XD does just that' and is a Shell Extension in the os & utilities category. There are five alternatives to Skippy-XD for Linux, BSD and Mac. The best Skippy-XD alternative is KWin, which is both free and Open Source. Other great apps like Skippy-XD are Mission Control, x:choyce, SuperSwitcher and Robata.
KWin is a window manager for the X Window System, and is in the process of becoming a Wayland compositor. It is an 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.
Mission Control, formerly Exposé, is a feature of the macOS operating system.
SuperSwitcher is a (more feature-ful) replacement for the Alt-Tab window switching behavior and Ctrl-Alt-Left/Right/Up/Down workspace switching behavior that is currently provided by Metacity.
Robata is a macOS app to quickly see all of your desktop windows, find the one you want, and switch to it.
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