GNU
GNU is the name of a computer operating system. The name is short for GNU's Not Unix. Richard Stallman leads the project working on GNU, known as the GNU Project. It was created to replace the UNIX operating system with all free and open source software. People often mistakingly call it Linux.
People have been working on GNU since it was started in 1983, but it is still being worked on. The central part of the operating system, called the Kernel, is not finished, and lots of people use Linux as the kernel with GNU (which is called a GNU/Linux Operating System). Software that runs on the GNU system often has been made for other computer software systems like Microsoft Windows and Mac OS X and is often compatible with other systems inspired by UNIX.
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