4Dwm

4Dwm is a window manager normally used on Silicon Graphics workstations running IRIX. 4Dwm is derived from the older mwm window manager and uses the Motif widget toolkit on top of the X Window System found on most Unix systems. 4Dwm on IRIX was one of the first default graphical user interface desktops to be standard on a Unix computer system. Other X window managers that mimic the 4Dwm look and feel exist, such as 4Dwm theme for IceWM and 5Dwm. 4Dwm refers to "Fourth dimension window manager"[1] and has no relation to dwm.