Run GNU Utilities Under Windows

Cygwin inclued tools:
bc, bison, bzip, diffutils, fileutils, findutils, flex, gawk, grep, gsar, gzip, indent, jwhois, less, m, make, patch, recode, rman, sed, shellutils, tar, textutils, unrar, wget, which

Cygwin makes possible to port software running on POSIX systems such as Linux, BSD, and other Unix systems to Windows.

Sometime if you want to run wget for example under Windows without going through Cygwin.

Download Cygwin

Visit Cygwin Project page