Where can I find GNU for NT?

Cygwin consists of a library that implements the POSIX system call API in terms of Win32 system calls, a GNU development toolchain (such as GCC and GDB) to allow basic software development tasks, and a large number of application programs equivalent to common programs on the Unix system. At this point, almost all open-source programs on Unix have been ported to Cygwin, including the X Window System, KDE, Gnome, Apache, TeX, and various others. A mechanism has been created for installing inetd, syslogd, sshd, Apache and other daemons as standard Windows services, allowing a Microsoft Windows system to function much like a Unix or Linux server. All of these programs are installed through the standard Cygwin setup program, which downloads the necessary packages from the Internet. The setup program can be rerun as necessary to update programs to their latest versions or add or remove programs. (Various other features are provided by setup, such as the ability to install the source code along with the binaries.)