Example image of eyePlorer eyePlorer map for 'XNU': Apple Inc. Darwin (operating system) Free and open source software Kernel (computing) Mac OS X Operating system Acronym and initialism Unix Carnegie Mellon University Hybrid kernel Mach (kernel) NeXT NeXTSTEP C++ FreeBSD Memory protection Message passing Microkernel Monolithic kernel ARM architecture PowerPC Symmetric multiprocessing X86 X86-64 Berkeley Software Distribution Debugging Inter-process communication O Preemption (computing) Process (computing) Real-time computing Thread (computer science) Virtual memory 32-bit 64-bit Mac OS X Snow Leopard Userland (computing) User space Mac Pro Xserve Direct memory access Graphics processing unit Loadable kernel module Device driver Object-oriented programming Elgato Host controller interface IEEE 1394 interface Parallels Desktop for Mac Universal Serial Bus