The X Window System


Combines graphical programs the UNIX way.
enlightenment - manages windows
gnome-pager - provides access to programs and desktops
panel - customizable menus, buttons, applet dock
gmc - file manager and desktop icons

Layered libraries provide programmer support
xlib - puts pixels, lines, areas on screen
Xaw - widget library (file dialogs, labels, text entry, ...)
gtk+ - gimp toolkit, modern 3d widgets
gnome - layered on top of gtk, provides consistent app look and feel