Tru64 UNIX Architecture Neutral Distribution Format XNU Mac operating systems Richard Rashid Potassium hexafluorozirconate Cathedral Basilica of Saints Peter and Paul (Philadelphia) History of the Berkeley Software Distribution Mach (kernel) Synergy DBL Darwin (operating system) Jon Callas Berkeley Software Distribution HP-UX List of operating systems OkCupid Kialo Comparison of BSD operating systems 64-bit computing Timeline of operating systems Unix Open Science Infrastructure Economics of open science Microkernel Bibliometrics Criticism of Netflix Comparison of Java virtual machines Comparison of operating systems Comparison of operating system kernels