The goal of IceWM is to provide a small, fast and familiar window
manager for the X11 window system. Compatibility with the
mwm window manager is desired and will be implemented where
appropriate.
IceWM originally was designed to emulate the look of Motif, OS/2 Warp 4, OS/2 Warp 3 and Windows 95. Since it has a theming engine (hint: http://www.icewm.org/) others styles are possible.
It also tries to combine the feel of the above systems whenever it is compatible.
Generally, it tries to make all functions available both by keyboard and by mouse (this is not currently possible when using mouse focus).
Extreme configurability similar to fvwm and many other window
managers is NOT the goal.
Further information can be found at http://icewm.themes.org/.