AfterStep

AfterStep is a free, open-source window manager for the X Window System that emulates the NeXTSTEP user interface. It is designed to be highly configurable, offering NeXT-style window decorations, a dock-like panel for launching applications, and desktop icons. The look and behavior can be extensively customized through themes and a text-based configuration system.

Configuration and theming: AfterStep is controlled by one or more aftersteprc files that define desktops (desks), window rules, styles, and decorations. Themes can change window borders, colors, backgrounds, and the appearance of the dock and desktop icons. Users edit plain text files or install theme packages to apply new looks.

Desks and dock: The software typically presents a desktop with multiple workspaces and a built-in dock or panel that holds application launchers. Window decorations are customizable, and windows can be arranged with NeXTSTEP-inspired shading and shadows to create a distinctive, three-dimensional appearance.

History and status: AfterStep began in the 1990s as a NeXTSTEP-inspired continuation of earlier window managers for the X Window System. It has had several maintainers and forks over the years. In recent times, development slowed as newer desktop environments gained popularity; nevertheless, AfterStep remains in use among enthusiasts and those seeking a retro aesthetic or a lightweight, highly configurable workflow.

It is one of several NeXTSTEP-inspired window managers for X11, alongside Window Maker and others.