Xfree
Cygwin X-Launcher v.1.22.0048
The X-Launcher is a utility created to tweak and configure the initial settings for an X-Server of the Cygwin project. Cygwin has been for some years an excellent emulator of the Linux platform for Windows.
Mocha X Server v.2.0
Mocha X Server is a simple to use PC X server software program that is running on a standard PC Windows platform, such as Windows XP.