High Quality Content by WIKIPEDIA articles! AfterStep is a stacking window manager for the X Window System. The goal of AfterStep`s development is to provide for flexibility of desktop configuration, improved aesthetics and efficient use of system resources, and was used in such distributions as MachTen. AfterStep originally was a variant of FVWM modified to resemble NeXTSTEP, but as the development cycle progressed, it diverged from its FVWM roots.