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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.
BSD Cygwin Linux HP-UX iOS Maemo macOS Solaris OpenSSH [b] The OpenBSD project 1999-12-01 [c] AIX 9.9 [6] 2024-09-19 BSD: Android BSD Cygwin Linux HP-UX iOS Maemo OpenVMS macOS Solaris Windows z/OS PuTTY: Simon Tatham: 1999-01-22 BSD 0.82 [7] 2024-11-27 MIT: Linux macOS Solaris Windows SecureCRT: VanDyke Software 1998–06 Linux 9.3.1 [8] 2022 ...
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.
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 ...
Linux, macOS, NetBSD, OpenBSD, Windows: Terminal program for Windows, Linux, OpenBSD, NetBSD, Mac OS X, and FreeBSD Telix: Character: Serial port: MS-DOS: Terminal emulator for MS-DOS (discontinued since 1997) Tera Term: Character: Serial port, Telnet, xmodem and SSH 1 & 2 Windows: Tera Term is an open-source, free, software terminal emulator ...
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.
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]
FreeBSD is a free-software Unix-like operating system descended from the Berkeley Software Distribution (BSD). The first version was released in 1993 developed from 386BSD [3] —the first fully functional and free Unix clone—and has since continuously been the most commonly used BSD-derived operating system.