Operating System Design/Case Studies/GNU Hurd

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GNU Hurd is a free Unix-like operating system developed by the GNU Project. Hurd was initiated in 1990 to add the only missing feature in the GNU operating system ‒ a kernel. Although under development for over 20 years, there is still no stable release.

It consists of a group of 24 server processes that run on the Mach microkernel. These servers provide most OS features, from authentication to filesystems.