XFree86 is an Open Source version of the X Window System that supports several UNIX(R) and UNIX-like operating systems (such as Linux, the BSDs and Solaris x86) on Intel and other platforms. This version is compatible with X11R6.6.
See the Copyright Notice.
The sources for XFree86 4.6.0 are available by anonymous ftp from:
Binaries for OpenBSD/i386 3.4 and later are available from:
XFree86 also builds on other OpenBSD architectures. See section Building on other architectures for details.