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Openbsd
OpenBSD is a security-focused operating system, security-focused, free and open-source, Unix-like operating system based on the Berkeley Software Distribution (BSD). Theo de Raadt created OpenBSD in 1995 by fork (software development), forking NetBSD. According to the website, the OpenBSD project emphasizes "portability, standardization, correctness, proactive security and integrated cryptography." The OpenBSD project maintains software portability, portable versions of many subsystems as package manager, packages for other operating systems. Because of the project's preferred BSD license, many components are reused in proprietary and corporate-sponsored software projects. The firewall (computing), firewall code in Apple Inc., Apple's macOS is based on OpenBSD's PF (firewall), PF firewall code, Android (operating system), Android's Bionic (software), Bionic C standard library is based on OpenBSD code, LLVM uses OpenBSD's regular expression library, and Windows 10 uses OpenSSH (Op ...
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Theo De Raadt
Theo de Raadt (; ; born May 19, 1968) is a South African-born software engineer A software engineer is a person who applies the principles of software engineering to the design, development, maintenance, testing, and evaluation of computer software Software is a collection of Instruction (computer science), instructions ... who lives in Calgary Calgary Calgary ( ) is a city in the western Canadian province The provinces and territories of Canada are sub-national divisions within the geographical areas of Canada Canada is a country in the northern part of North America ..., Alberta ("Strong and free") , image_map = Alberta in Canada 2.svg , Label_map = yes , coordinates = , official_lang = English , capital = Edmonton Edmonton ( ) is the capital ..., Canada. He is the founder and leader of the OpenBSD OpenBSD is a security-focused operating system, security-focused, f ...
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ISC License
The ISC license is a permissive free software license A permissive software license, sometimes also called BSD-like or BSD-style license, is a free-software license with only minimal restrictions on how the software can be used, modified, and redistributed, usually including a warranty disclaimer. ... published by the Internet Software Consortium, now called Internet Systems Consortium Internet Systems Consortium, Inc., also known as ISC, is a Delaware General Corporation Law, Delaware-registered, 501(c)(3) non-profit corporation that supports the infrastructure of the universal, self-organizing Internet by developing and mainta ... (ISC). It is functionally equivalent to the simplified BSD and MIT Massachusetts Institute of Technology (MIT) is a private land-grant research university A research university is a university A university ( la, universitas, 'a whole') is an educational institution, institution of higher education, hi ... licenses, but without l ...
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X86-64
x86-64 (also known as x64, x86_64, AMD64, and Intel 64) is a 64-bit version of the x86 instruction set, first released in 1999. It introduced two new modes of operation, 64-bit mode and compatibility mode, along with a new 4-level paging mode. With 64-bit mode and the new paging mode, it supports vastly larger amounts of virtual memory and physical memory than was possible on its 32-bit predecessors, allowing programs to store larger amounts of data in memory. x86-64 also expands general-purpose registers to 64-bit, and expands the number of them from 8 (some of which had limited or fixed functionality, e.g. for stack management) to 16 (fully general), and provides numerous other enhancements. Floating-point operation, Floating point operations are supported via mandatory SSE2-like instructions, and x87/MMX (instruction set), MMX style registers are generally not used (but still available even in 64-bit mode); instead, a set of 16 vector registers, 128 bits each, is used. (Ea ...
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KornShell
KornShell (ksh) is a Unix shell A Unix shell is a command-line interpreter or shell Shell may refer to: Architecture and design * Shell (structure)A shell is a type of structural element which is characterized by its geometry, being a three-dimensional solid whose thickness ... which was developed by David Korn at Bell Labs Nokia Bell Labs (formerly named Bell Labs Innovations (1996–2007), AT&T Bell Laboratories (1984–1996) and Bell Telephone Laboratories (1925–1984)) is an American industrial research and scientific development company A company, ab ... in the early 1980s and announced at USENIX USENIX is an American 501(c)(3) nonprofit membership organization A membership organization is any organization that allows people or entities to subscribe, and often requires them to pay a membership fee or "subscription". Membership organiza ... on July 14, 1983. The initial development was based on Bourne shell The Bourne shell (sh) is a Shell (c ...
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ARMv7
ARM (stylised in lowercase as arm, previously an acronym for Advanced RISC Machines and originally Acorn RISC Machine) is a family of reduced instruction set computing (RISC) instruction set, architectures for central processing unit, computer processors, configured for various environments. Arm Ltd. develops the architecture and licenses it to other companies, who design their own products that implement one of those architecturesincluding System on a chip, systems-on-chips (SoC) and System on module, systems-on-modules (SoM) that incorporate different components such as memory, interfaces, and Radio#Radio communication, radios. It also designs semiconductor intellectual property core, cores that implement this instruction set and licenses these designs to a number of companies that incorporate those core designs into their own products. There have been several generations of the ARM design. The original ARM1 used a 32-bit computing, 32-bit internal structure but had a 26- ...
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ARMv8
ARM (stylised in lowercase as arm, previously an acronym for Advanced RISC Machines and originally Acorn RISC Machine) is a family of reduced instruction set computing In computer engineering Computer engineering (CoE or CpE) is a branch of engineering Engineering is the use of scientific principles to design and build machines, structures, and other items, including bridges, tunnels, roads, v ... (RISC) architectures for computer processors, configured for various environments. Arm Ltd. develops the architecture and licenses it to other companies, who design their own products that implement one of those architecturesincluding systems-on-chips (SoC) and systems-on-modules (SoM) that incorporate different components such as memory, interfaces, and radios Radio is the technology of signaling and telecommunication, communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz ...
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Permissive Software License
A permissive software license, sometimes also called BSD-like or BSD-style license, is a free-software Free software (or libre software) is computer software Software is a collection of Instruction (computer science), instructions and data (computing), data that tell a computer how to work. This is in contrast to Computer hardware, physical ... license A license (American English American English (AmE, AE, AmEng, USEng, en-US), sometimes called United States English or U.S. English, is the set of varieties of the English language native to the United States. Currently, American English ... which instead of copyleft Copyleft is the practice of granting the right to freely distribute and modify with the requirement that the same rights be preserved in derivative works created from that property. Copyleft in the form of s can be used to maintain conditions ... protections, carries only minimal restrictions on how the software can be used, modified, and r ...
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BSD Licenses
BSD licenses are a family of permissive free software license A permissive software license, sometimes also called BSD-like or BSD-style license, is a free-software license with only minimal restrictions on how the software can be used, modified, and redistributed, usually including a warranty disclaimer. ...s, imposing minimal restrictions on the use and distribution of covered software. This is in contrast to copyleft Copyleft is the practice of granting the right to freely distribute and modify with the requirement that the same rights be preserved in derivative works created from that property. Copyleft in the form of s can be used to maintain conditions ... licenses, which have share-alike The copyleft.html"_;"title="Creative_Commons_icon_for_Share-Alike,_a_variant_of_the_copyleft">Creative_Commons_icon_for_Share-Alike,_a_variant_of_the_copyleft_symbol Share-alike_is_a_Copyright.html" ;"title="copyleft_symbol.html" ;"title="copylef ... requirements. The origi ...
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PowerPC
PowerPC (with the backronym A backronym, or bacronym, is an acronym formed from a word that existed prior to the invention of the backronym. Unlike a typical acronym, in which a new word is constructed from a phrase, the phrase corresponding to the backronym is selected to fi ... Performance Optimization With Enhanced RISC – Performance Computing, sometimes abbreviated as PPC) is a reduced instruction set computer In computer engineering Computer engineering (CoE or CpE) is a branch of engineering that integrates several fields of computer science and electronic engineering required to develop computer hardware and computer software, software. Com ... (RISC) instruction set architecture In computer science Computer science deals with the theoretical foundations of information, algorithms and the architectures of its computation as well as practical techniques for their application. Computer science is the study of Algo ... (ISA) created by the 1991 App ...
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FVWM
The F Virtual Window Manager is a virtual window manager for the X Window System. Originally a twm derivative, FVWM has evolved into a powerful and highly configurable environment for Unix-like systems. History In 1993, during his work analyzing acoustic signatures for the United States Department of Defense, Robert Nation began Hacker (hobbyist), hacking twm with the intent of simultaneously reducing memory usage and adding support for virtual window manager, virtual desktops. Already known for his rxvt terminal emulator, Nation worked on reducing the memory consumption of his new window manager. Deciding to test FVWM's reception, on June 1, 1993, he bundled it with a rxvt release. In 1994 Rob Nation stopped developing FVWM and made Charles Hines the maintainer. Rob Nation's last release of FVWM was fvwm-1.24r. The post-Rob Nation version of FVWM uses a different configuration file format and has a significantly different architecture. Many Linux distributions, as a result, di ...
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X Window System
The X Window System (X11, or simply X) is a windowing system for bitmap displays, common on Unix-like A Unix-like (sometimes referred to as UN*X or *nix) operating system An operating system (OS) is system software that manages computer hardware, computer software, software resources, and provides common daemon (computing), services for compu ... operating systems. X provides the basic framework for a GUI environment: drawing and moving windows on the display device and interacting with a mouse and keyboard. X does not mandate the user interfacethis is handled by individual programs. As such, the visual styling of X-based environments varies greatly; different programs may present radically different interfaces. X originated as part of Project Athena Project Athena was a joint project of Massachusetts Institute of Technology, MIT, Digital Equipment Corporation, and IBM to produce a campus-wide distributed computing environment for educational use. It was launched in 19 ...
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Monolithic Kernel
A monolithic kernel is an operating system architecture where the entire operating system is working in kernel space A modern computer operating system An operating system (OS) is system software that manages computer hardware, computer software, software resources, and provides common daemon (computing), services for computer programs. Time-sharing opera .... The monolithic model differs from other operating system architectures (such as the microkernel In computer science, a microkernel (often abbreviated as μ-kernel) is the near-minimum amount of software that can provide the mechanisms needed to implement an operating system (OS). These mechanisms include low-level address space management, ... architecture) in that it alone defines a high-level virtual interface over computer hardware. A set of primitives or system call In computing Computing is any goal-oriented activity requiring, benefiting from, or creating computing machinery. It includes the study and ...
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