Cygwin at gos.i
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Get that Linux feeling - on Windows!

Cygwin is:

1.a collection of tools which provide a Linux look and feel environment for Windows.

2.a DLL (cygwin1.dll) which acts as a Linux API layer providing substantial Linux API functionality. 

The Cygwin DLL currently works with all recent, commercially released x86 32 bit and 64 bit versions of Windows, with the exception of Windows CE and Windows NT4.