Window Manager
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Window Maker is an X11 window manager originally designed to provide integration support for the GNUstep Desktop Environment. In every way possible, it reproduces the elegant look and feel of the NEXTSTEP user interface. It is fast, feature rich, easy to configure, and easy to use. It is also free software, with contributions being made by programmers from around the world. Window Maker includes compatibility options which allow it to work with other popular desktop environments, namely GNOME and KDE, and comes with a powerful GUI configuration editor, called WPrefs, which removes the need to edit text-based configuration files by hand. The obligatory screenshot (click the image for a larger view):
Window Maker: Your NeXT Window Manager
X Window System
A historical example of graphical user interface and applications common to the MIT X Consortium's distribution running under the twm window manager: X Terminal , Xbiff , xload and a graphical manual page browser The X Window System (commonly known as X11 , based on its current major version being 11, or shortened to simply X , and sometimes informally X-Windows ) is a computer software system and network protocol that provides a basis for graphical user interfaces (GUIs) and rich input device capability for networked computers . It creates a hardware abstraction layer where software is written to use a generalized set of commands , allowing for device independence and reuse of programs on any computer that implements X. X originated at the Massachusetts Institute of Technology (MIT) in 1984.
Open Source - Tools - X11
Intro ¶ The XQuartz project is an open-source effort to develop a version of the X.org X Window System that runs on OS X. Together with supporting libraries and applications, it forms the X11.app that Apple has shipped with OS X since version 10.5.