Cygwin

Cygnus Consulting (now part of Red Hat) created the cygwin environment. First creating cgywin.dll, a shared library that provides Unix system call emulation, they ported a large number of GNU utilities to various versions of Microsoft Windows. The greatest functionality comes under Windows/NT, Windows 2000, and Windows XP, although the environment can and does work under Windows 95/98/ME, as well.

The cygwin environment uses bash for its shell, GCC for its C compiler, and the rest of the GNU utilities for its Unix toolset. A sophisticated mount command provides a mapping of the Windows C:\path notation to Unix filenames.

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The cygwin project can be found at http://www.cygwin.com.