Cygwin/XFree86
You can use Cygwin/XFree86 as a free alternative to X-Win.Cygwin/XFree86 consists of an X Server, Xlib and nearly all of the standard X clients, such as xterm, xman, xhost, xdpyinfo, xclock, xedit, xfig and many more.
Starting Cygwin/X: startx
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