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An Open Source Implementation of X Window System which 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.

XFree86, provides a client/server interface between display hardware (the mouse, keyboard, and video displays) and the desktop environment while also providing both the windowing infrastructure and a standardized application interface (API).
Free86 is platform-independent, network-transparent and extensible.