Xorg is a full featured X server that was originally designed for UNIX and UNIX-like operating systems running on Intel x86 hardware. It now runs on a wider range of hardware and OS platforms.
This work was derived by the X.Org Foundation from the XFree86 Project's XFree86 4.4rc2 release. The XFree86 release was originally derived from X386 1.2 by Thomas Roell which was contributed to X11R5 by Snitily Graphics Consulting Service.
Xorg operates under a wide range of operating systems and hardware platforms : Intel x86 & x86_64 architecture, as well as Compaq Alpha, Intel IA64, SPARC and PowerPC. The most widely supported operating systems are the free/OpenSource UNIX-like systems such as Linux, FreeBSD, NetBSD, OpenBSD, and Solaris. Commercial UNIX operating systems such as UnixWare are also supported. Other supported operating systems include GNU Hurd. Darwin and Mac OS X are supported with the XDarwin X server. Win32/Cygwin is supported with the XWin X server.