XFree86 is a free
? and
Open Source implementation of the
X Window System which runs under
Linux,
FreeBSD,
NetBSD,
OpenBSD,
Solaris,
MacOS X,
Windows NT and several other minor flavors of
Unix. Currently (01OCT2001), XFree86 supports the X11R6.5.1 spec, including the GLX and Render extensions. Anyone who's interested can get it at
http://www.xfree86.org