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GNU Hurd is a collection of microkernel servers written as part of GNU, for the GNU Mach microkernel. It has been under development since 1990 by the GNU Project of the Free Software Foundation, designed as a replacement for the Unix kernel, [4] and released as free software under the GNU General Public License.
Multiserver Microkernel (Hurd kernel) or Monolithic (Linux-libre kernel, fork of Linux kernel, and other kernels which are not part of the GNU Project) C: 1:1 Unix-like: 2.4 on Linux-libre kernel (not on Hurd kernel) Linux: ReactOS: GPL, LGPL Hybrid C, C++ Windows-like: No RISC OS: Apache 2.0 Monolithic (with cooperative multitasking) ARM ...
The Linux kernel is a free and open source, [11]: 4 Unix-like kernel that is used in many computer systems worldwide. The kernel was created by Linus Torvalds in 1991 and was soon adopted as the kernel for the GNU operating system (OS) which was created to be a free replacement for Unix .
The portability section of the Linux kernel article contains information and references to technical details. Note that further components like a windowing system, or programs like Blender, can be present or absent. Fundamentally any software has to be ported, i.e. specifically adapted, to any kind of hardware it is supposed to be executed on.
Under Unix, from a programming standpoint, the distinction between the two is fairly thin; the kernel is a program, running in supervisor mode, [c] that acts as a program loader and supervisor for the small utility programs making up the rest of the system, and to provide locking and I/O services for these programs; beyond that, the kernel didn ...
MINIX is a Unix-like operating system based on a microkernel architecture, first released in 1987 and written by American-Dutch computer scientist Andrew S. Tanenbaum.It was designed as a clone of the Unix operating system [10] and one that could run on affordable, Intel 8086-based home computers; MINIX was targeted for use in classrooms by computer science students at universities.
According to the Free Software Foundation Latin America, Linux-libre is a modified version of the Linux kernel that contains no binary blobs, obfuscated code, or code released under proprietary licenses. [7] In the Linux kernel, those types of code are mostly used for proprietary firmware images. While generally redistributable, they do not ...
Zephyr uses Kconfig and devicetree as its configuration systems, inherited from the Linux kernel but implemented in the programming language Python for portability to non-Unix operating systems. [17] The RTOS build system is based on CMake, which allows Zephyr applications to be built on Linux, macOS, and Microsoft Windows. [18]