A window manager is system software that controls the placement and appearance of windows within a windowing system in a graphical user interface.
FVWM stands for "F Virtual Window Manager" (The F currently has no official meaning). It is a window manager for the X Window System. It was based on TWM (Tabbed Window Manager), but added support for Virtual Screens, making it more powerful. FVWM has evolved into a highly configurable environment for Unix-like systems.
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IceWM is a window manager for the X Window System. It is relatively lightweight in terms of memory and CPU usage, and comes with themes that allow it to imitate several graphical user interfaces. IceWM is a "stacking window manager" (also called "floating window manager"), drawing all windows in a specific order, allowing them to overlap.
Window Maker is a window manager for the X Window System. It is designed to emulate NeXTstep GUI. Window Maker is considered to be fast, efficient and stable.