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XFree86® Home to the X Window System
XFree86 - Wikipedia
XFree86(1) manual page
XFree86(1) manual page
Overview of XFree86 4.x.
Documentation for XFree86® version 4.8.0
XFree86 - Linux Documentation Project
The Current XFree86® Release: 4.8.0.
XFree86® Home to the X Window System
Xfree86 - Free Software Directory