GNU Mach, an implementation of the Mach microkernel, is the default Microkernel#Microkernels in the GNU Hurd kernel (computers) of the GNU operating system. The latest version is GNU Mach 1.3, which was created in 2002.

There was an abortive plan to switch to OSKit Mach , which was a code branch of GNU Mach. Since then, some effort have been put into porting HURD to the L4 microkernel family, but progress is slowed by lack of resources.

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