About

XQuartz (commonly referred to as X11.app) is Apple Inc.'s version of the X server, a component of the X Window System, for Mac OS X. The current version of XQuartz is a DDX[clarification needed] included in the X.Org Server and implements support for hardware-accelerated 2D graphics (in versions prior to 2.1), hardware OpenGL acceleration and integration with Aqua, the Mac OS X graphical user interface (GUI).

(via wikipedia)

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