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GNU
The GNU project was publicly announced by Richard Stallman. GNU was to be a complete Unix-like operating system composed entirely of free software. Software development work began in January 1984. By the beginning of the 1990s, the project had produced or collected most of the necessary components of this system, including libraries, compilers, text editors, and a Unix shell. Thus the GNU mid-level portions of the operating system were almost complete. The upper level could be supplied by the X Window System, but the lower level, which consisted of a kernel, device drivers, and daemons, was still mostly lacking. In 1990, the GNU project began developing the GNU Hurd kernel, based on the Mach microkernel.

