Xming is the leading X Window System Server for Microsoft Windows 8/7/Vista/XP (+ server 2012/2008/2003). It is fully featured, small and fast, simple to install and because it is standalone native Microsoft Windows, easily made portable (not needing a machine-specific installation).
License
BSD License, Public Domain, MIT License, zlib/libpng LicenseFollow Xming X Server for Windows
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