AfterStep is a window manager for the Unix X Window System.
Originally based on the look and feel of the NeXTStep interface, it 
provides end users with a consistent, clean, and elegant desktop. The 
goal of AfterStep development is to provide for flexibility of desktop 
configuration, improving aestetics, and efficient use of system resources.
Some of the distinguishing features of AfterStep compared to other window 
managers are its low usage of resources, stability, and configurability.