Cygwin is a Unix-like environment and command-line interface for Microsoft Windows. Cygwin provides native integration of Windows-based applications, data, and other system resources with applications, software tools, and data of the Unix-like environment. Thus it is possible to launch Windows applications from the Cygwin environment, as well as to use Cygwin tools and applications within the Windows operating context.
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| ITEM | DESCRIPTION |
| Main Developer | Cygwin Solutions |
| License | GNU GPLv3 |
| OS | Windows |
| Written In | C/C++ |
| Official Site | http://www.cygwin.com |
S.Yatsuzuka