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According to OpenBSD expert Michael W. Lucas, OpenBSD "is widely regarded as the most secure operating system available anywhere, under any licensing terms." [14] OpenBSD has spawned numerous child projects such as OpenSSH, OpenNTPD, OpenBGPD, OpenSMTPD, PF, CARP, and LibreSSL. Many of these are designed to replace restricted alternatives.
See comparison of Linux distributions for a detailed comparison. Linux distributions that have highly modified kernels — for example, real-time computing kernels — should be listed separately. There are also a wide variety of minor BSD operating systems, many of which can be found at comparison of BSD operating systems.
Linux: GPL version 2 only: Monolithic with modules C: 1:1 Unix-like: 4.4 elks: FreeBSD: BSD; GPL, LGPL software usually included Monolithic with modules C 1:1 BSD, Unix-like 11 DragonFly BSD OpenBSD: BSD Monolithic C 1:1 BSD, Unix-like 6.4 MirOS: NetBSD: BSD Monolithic with modules C 1:1 BSD, Unix-like 7.0 OpenBSD DragonFly BSD: BSD Hybrid: C 1 ...
BSD Cygwin Linux HP-UX macOS Solaris webOS lsh: Niels Möller 1999-05-23 [8] BSD 2.1 [9] 2013-06-26 GPL-2.0-or-later: Linux Solaris macOS OpenSSH [c] The OpenBSD project 1999-12-01 AIX 9.9 [10] 2024-09-19 BSD: AmigaOS Android BSD Cygwin Linux HP-UX iOS macOS OpenVMS Solaris webOS Windows z/OS Teleport: Gravitational 2016-06-23 17.2.1 [11] 2025 ...
Name License Source model Target uses Status Platforms Apache Mynewt: Apache 2.0: open source: embedded: active: ARM Cortex-M, MIPS32, Microchip PIC32, RISC-V: BeRTOS: Modified GNU GPL: open source
Because of the large number and variety of available Linux distributions, they are all grouped under a single entry; see comparison of Linux distributions for a detailed comparison. There is also a variety of BSD and DOS operating systems, covered in comparison of BSD operating systems and comparison of DOS operating systems.
OpenBSD is a security-focused, free software, Unix-like operating system based on the Berkeley Software Distribution (BSD). Theo de Raadt created OpenBSD in 1995 by forking NetBSD 1.0. [4] The OpenBSD project emphasizes portability, standardization, correctness, proactive security, and integrated cryptography. [5]
CRUX is a Linux distribution mainly targeted at expert computer users. It uses BSD-style initscripts and utilizes a ports system similar to a BSD-based operating system. Chimera Linux: Chimera Linux is a Linux distribution created by Daniel Kolesa, a semi-active contributor to Void Linux. It uses a userland and core utilities based on FreeBSD.