The XFree86 Project, Inc is a global volunteer organisation which produces XFree86®, a freely redistributable open-source implementation of the X Window System. 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.