https://en.wikipedia.org/wiki/Cygwin/X
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 due to XFree86 licensing controversy, owing to concerns over …