Wikipedia
MkLinux
MkLinux is an open source computer operating system started by the Open Software Foundation Research Institute and Apple Computer in February 1996 to port Linux to the PowerPC platform, and Macintosh computers. MkLinux is short for "Microkernel Linux", which refers to the project's adaptation of the Linux kernel to run as a server hosted atop version 3.0 of the Mach microkernel.