GNU is a computer operating system composed entirely of free software. Its name is a recursive acronym for GNU's Not Unix, which was chosen because its design is Unix-like, but differs from Unix by being free software and by not containing any Unix code. GNU was founded by Richard Stallman and was the original focus of the Free Software Foundation (FSF).

The project to develop GNU is known as the GNU Project, and programs released under the auspices of the GNU Project are called GNU packages or GNU programs. The system's basic components include the GNU Compiler Collection (GCC), the GNU Binary Utilities (binutils), the bash shell, the GNU C library (glibc), and GNU Core Utilities (coreutils).

As of 2007, GNU is being actively developed. Although most components have been completed long ago and have been in production use for a decade or more, its official kernel, GNU Hurd, is incomplete and not all GNU components work with it. For this reason, most GNU users use the third-party Linux kernel. While Linux has not been officially adopted as the kernel of GNU, GNU does officially include other third party software such as the X.Org release of the X Window System and the TeX typesetting system. Many GNU programs have also been ported to numerous other operating systems such as Microsoft Windows, BSD variants, Solaris and Mac OS.

The GNU General Public License (GPL), the GNU Lesser General Public License (LGPL), and the GNU Free Documentation License (GFDL) were written for GNU, but are also used by many unrelated projects.
All users of GNU software.

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Mario Young
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