XFree86 is an open source X11-based desktop infrastructure.
The XFree86 Project, Inc is a global volunteer organisation which produces XFree86, a freely redistributable open-source implementation of the X Window System since 1992.
XFree86 runs primarily on UNIX and UNIX-like operating systems like Linux, all of the BSD variants, Sun Solaris both native 32 and 64 bit support, Solaris x86, Mac OS X (via Darwin), SGI's Irix as well as other platforms like OS/2 and Cygwin.
What XFree86 does, is provide a client/server interface between the display hardware (those physical things like the mouse, keyboard, and video displays) and the desktop environment, (this is typically called a window manager as it deals with how X is displayed i.e. the overall appearance).
Yet X it goes beyond that and also gives the infrastructure and a standardized application interface (API). All of this, makes XFree86 platform-independent, network-transparent and extensible.
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