port of the X Window System server to Windows. It shares the same source code base as Cygwin/X, but does not depend on the Cygwin environment or cygwin1.dll. Xming is a fully featured X11 server for Windows that is very simple to install and use.
The UWIN package allows UNIX applications to be built and run on Windows XP/2000/NT/ME/98/95 with few, if any, changes necessary. UWIN source and binaries are available under the open source Common Public License 1.0.
automatically hardens software applications against a wide range of bugs. These bugs — known as memory errors — often end up as serious security vulnerabilities, cause crashes, or lead to unpredictable behavior.
Win32-versions of GNU tools, or tools with a similar open source licence. The ports are native ports, that is they rely only on libraries provided with any 32-bits MS-Windows operating system, such as MS-Windows 95 / 98 / 2000 / NT / XP
a Linux-like environment for Windows. A way to run native linux apps on Windows and make way to magically make native Windows apps aware of UNIX ® functionality after a rebuild.
MSLU comes with licensing terms that are highly unfriendly to Open Source applications: although you can freely distribute unicows.dll with your application, your licensing terms must meet certain conditions that no Open Source license can.
a suite of tools based on the Unix tool design principles allowing the processing of Windows application data with sophisticated data manipulation pipelines.