Kernel Source Archive: Kernels

The Kernel Source Archive contains the sources to a number of open source operating system kernels.

CMU Mach
Mach was one of the earliest examples of a microkernel-based operating system, and its various offshoots (including XNU, the kernel at the heart of Mac OS X) are still widely used today.
FreeDOS
FreeDOS is free version of the DOS operating system, released under the terms of the GNU General Public License and almost 100% compatible with Microsoft's MS-DOS.
GNU Mach
GNU Mach is a fork of the University of Utah's Mach 4 project, which continued development of CMU Mach when development at CMU ended after the release of CMU Mach 3.0.
MkLinux
MkLinux was a project jointly instigated by the Open Software Foundation's Research Institute and Apple Computer to port the Linux kernel to the Mach microkernel on Apple's PowerPC hardware.
OSF Mach
OSF Mach was originally the OSF's variant of CMU's Mach 2.5, but was later updated with sources from the CMU Mach 3.0 releases. OSF Mach formed basis of OSF/1 (now HP's Tru64 UNIX) and MkLinux, and portions of OSF Mach are present in XNU, the Mach-based kernel of Mac OS X and Darwin.

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