You may have used the Openbox desktop without knowing it: While Openbox is a great window manager on its own, it also serves as the window manager "engine" for desktop environments like LXDE and LXQT, and it can even manage KDE and GNOME. Aside from being the foundation for several desktops, Openbox is arguably one of the easiest window managers to configure for anyone who doesn't want to learn all the options to put into a config file.
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