OSF/1 Mach (kernel) Tru64 UNIX MkLinux Open Software Foundation XNU Richard Rashid Ultrix Encore Computer GNU Hurd Darwin (operating system) DECstation History of the Berkeley Software Distribution HP 9000 Mac operating systems A/UX Microkernel Status key History of Unix Comparison of BSD operating systems Dassault Rafale Timeline of operating systems Kernel (operating system) Daniela Schiller List of operating systems Unix NCSA Mosaic Quantum mind Quantum entanglement Comparison of operating system kernels Academy Award for Technical Achievement List of SS personnel