In Unix computing, IceWM is a X window manager for the X Window System graphical infrastructure, written by Marko Macek. It was coded from scratch in C plus plus and is released under the terms of the GNU Library General Public License. It is relatively lightweight in terms of memory and CPU usage, and comes with themes that allow it to imitate the UI of Windows 95, OS/2, Motif (widget toolkit), and other graphical user interfaces.

The primary aim of the IceWM project is to have a window manager which has a good look and feel and is, at the same time, lightweight. IceWM can be configured from plain text files stored in a user s home directory, making it easy to customize and copy settings. IceWM has an optional, built-in taskbar with menu, tasks display, network and CPU meters, mail check and configurable clock. Official support for GNOME and KDE menus are available as a separate package. External graphical programs for editing configuration and menu exist.

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