1) Free software programmed in C 2) Welsh boy name 
twm (Tab Window Manager) is a window manager for the X Window System. Started in 1987 by Tom LaStrange, it has been the standard window manager for the X Window System since version X11R4. The name originally stood for Tom`s Window Manager, but the software was renamed Tab Window Manager by the X Consortium when they adopted it in 1989. twm is a ....
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Tab Window Manager for the X Window System.
Traffic Warden Manager