Cygwin/X
From Cygwin Wiki
< Cygwin
Image:Wfm cygwinx rootless.png
Cygwin/X running rootless on Microsoft Windows XP. The screen shows X applications (xeyes, xclock, xterm) sharing the screen with native Windows applications (Date and Time, Calculator).
Cygwin/X is an implementation of the X Window System that runs under Microsoft Windows. It is part of the Cygwin project, and is installed using Cygwin's standard setup system. As with the rest of Cygwin, Cygwin/X is free software, licensed under the GNU General Public License (GPL).
Cygwin/X originally used XFree86, but now uses the X.Org Server, owing to concerns over XFree86's new software license not being compatible with the GPL.
The latest release of Cygwin/X was on 8 July 2005, and the project is currently not maintained.
[edit] Features
Cygwin/X can run rootless. This allows X applications to draw their windows directly onto the normal Windows desktop, rather than into an enclosing root window.
