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Cygwin/X

The screen shows X applications (xeyes, xclock, xterm) sharing the screen with native Windows applications (Date and Time, Calculator).
Developer(s) Cygnus Solutions, Red Hat and others
Stable release 1.6.0 / June 25, 2009; 8 month(s) ago (2009-06-25)
Preview release 1.7.1 / December 2, 2009; 3 month(s) ago (2009-12-02)
Operating system Microsoft Windows
License X11 License
Website x.cygwin.com

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. Cygwin/X is free software, licensed under the X11 License.

Cygwin/X was originally based on XFree86, but switched to the X.Org Server, owing to concerns over XFree86's new software license^{[citation needed]} not being compatible with the GPL.

After a long pause following a 8 July 2005 release, the project appears to have been revitalised and the developers have released a version based on the X.org modular 7.4 release on 12 November 2008.

Features

Cygwin/X can run rootless, i.e. without a root window for the display. X applications, which connect to such X display, rely on Microsoft Windows’ window manager to move, resize, hide etc. their windows. From the user’s side, that windows are placed directly onto the normal Windows desktop, rather than into any enclosing window of an "X desktop".

Cygwin/X can either provide GUI for local applications of UNIX type on the local machine, or accept connections from such application running on a remote computer, directly through IP network or via SSH tunneling.