OpenBSD

PuffyhttpdOpenBSD kernelOpenBSD Project
OpenBSD is a free and open-source security-focused operating system based on the Berkeley Software Distribution.wikipedia
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Berkeley Software Distribution

BSDBSD Unix*BSD
OpenBSD is a free and open-source security-focused operating system based on the Berkeley Software Distribution.
Today, "BSD" often refers to its descendants, such as FreeBSD, OpenBSD, NetBSD, or DragonFly BSD.

Theo de Raadt

Theo DeRaadt
Theo de Raadt created OpenBSD in 1995 by forking the codebase from NetBSD.
He is the founder and leader of the OpenBSD and OpenSSH projects, and was also a founding member of NetBSD.

OpenBSD security features

numerous security featuresOpenBSDsecurity features
The system is intended to be secure by default, and many of its security features are either missing or optional in other operating systems. OpenBSD's security enhancements, built-in cryptography, and the PF (packet filter) suit it for use in the security industry, such as on firewalls, intrusion-detection systems, and VPN gateways.
The OpenBSD operating system focuses on security and the development of security features. According to author Michael W. Lucas, OpenBSD "is widely regarded as the most secure operating system available anywhere, under any licensing terms."

NetBSD

BSDCryptographic Device DriverNetBSD Foundation
Theo de Raadt created OpenBSD in 1995 by forking the codebase from NetBSD.
He later founded a new project, OpenBSD, from a forked version of NetBSD 1.0 near the end of 1995.

LibreSSL

Android uses its C standard library, LLVM uses its regular expression library, and Windows 10 uses OpenSSH with LibreSSL.
The OpenBSD project forked LibreSSL from OpenSSL 1.0.1g in April 2014 as a response to the Heartbleed security vulnerability, with the goals of modernizing the codebase, improving security, and applying development best practices.

OpenSSH

SSH
Android uses its C standard library, LLVM uses its regular expression library, and Windows 10 uses OpenSSH with LibreSSL.
OpenSSH was first released in 1999, and is currently developed as part of the OpenBSD operating system.

Xenocara

OpenBSD ships with Xenocara, an implementation of the X Window System, and is suitable for use as a workstation.
Xenocara is the OpenBSD build infrastructure for the project's customized X.Org Server that uses a dedicated user by default to drop privileges and perform privilege separation, in accordance with the principle of least privilege.

Free and open-source software

free and open-sourcefree and open source softwarefree and open source
OpenBSD is a free and open-source security-focused operating system based on the Berkeley Software Distribution.
OpenBSD forked from NetBSD in 1995.

Cwm (window manager)

cwm
The project also includes three window managers in the main distribution: cwm, FVWM (part of the default configuration for Xenocara), and twm.
While it is primarily developed as a part of OpenBSD's base system, portable versions are available on other Unix-like operating systems.

FreeBSD

*BSDFreeBSD ProjectLinux emulation
In September 2005, the BSD Certification Group surveyed BSD users, showing that 33% used OpenBSD, behind FreeBSD with 77% and ahead of NetBSD with 16%.
As of FreeBSD 5.4, support for the Common Address Redundancy Protocol (CARP) was imported from the OpenBSD project.

Chromium (web browser)

ChromiumChromium ProjectChrome
, OpenBSD includes approximately 8000 packages in its software repository, including desktop environments such as GNOME, Plasma 4 and Xfce, and web browsers such as Firefox and Chromium.
OpenBSD has had Chromium available for i386 and amd64 platforms since late 2009.

OpenBSD Foundation

On 25 July 2007, OpenBSD developer Bob Beck announced the formation of the OpenBSD Foundation, a Canadian non-profit organization formed to "act as a single point of contact for persons and organizations requiring a legal entity to deal with when they wish to support OpenBSD."
The OpenBSD Foundation is a Canadian federal non-profit organization founded by the OpenBSD project "as a single point of contact for persons and organizations requiring a legal entity to deal with when they wish to support OpenBSD."

PF (firewall)

PFPacket FilterPacket Filter (PF)
OpenBSD's security enhancements, built-in cryptography, and the PF (packet filter) suit it for use in the security industry, such as on firewalls, intrusion-detection systems, and VPN gateways.
PF was developed for OpenBSD, but has been ported to many other operating systems.

Fork (software development)

forkforkedforks
Theo de Raadt created OpenBSD in 1995 by forking the codebase from NetBSD.
4) Successful branching, typically with differentiation (e.g., OpenBSD and NetBSD.)

OpenBSD Cryptographic Framework

cryptographic framework/dev/crypto
On 11 December 2010, Gregory Perry, a former technical consultant for the Federal Bureau of Investigation (FBI), emailed De Raadt alleging that the FBI had paid some OpenBSD ex-developers 10 years previously to insert backdoors into the OpenBSD Cryptographic Framework.
It is part of the OpenBSD Project, having been included in the operating system since OpenBSD 2.8 (December, 2000).

Secure by default

The system is intended to be secure by default, and many of its security features are either missing or optional in other operating systems.
OpenBSD claims to be the only operating system that is fully secure by default.

File (command)

fileFile Command command
Developers have applied these enhancements to OpenBSD versions of many common applications, such as tcpdump, file, tmux, smtpd, and syslogd.
The OpenBSD system has its own subset implementation written from scratch, but still uses the Darwin/Zoulas collection of magic file formatted information.

Xfce

xfwmMousepadTerminal
, OpenBSD includes approximately 8000 packages in its software repository, including desktop environments such as GNOME, Plasma 4 and Xfce, and web browsers such as Firefox and Chromium.
With 4.12, the project reiterated its commitment to Unix-like platforms other than Linux by featuring OpenBSD screenshots.

Security-focused operating system

security-focusedSecure operating systems
OpenBSD is a free and open-source security-focused operating system based on the Berkeley Software Distribution.
* OpenBSD is a research operating system for developing new security mitigations.

OpenSMTPD

smtpd
Developers have applied these enhancements to OpenBSD versions of many common applications, such as tcpdump, file, tmux, smtpd, and syslogd.
OpenSMTPD is primarily developed by Gilles Chehade, Eric Faurot and Charles Longeau as part of the OpenBSD project.

Tcpdump

Developers have applied these enhancements to OpenBSD versions of many common applications, such as tcpdump, file, tmux, smtpd, and syslogd.
Tcpdump works on most Unix-like operating systems: Linux, Solaris, FreeBSD, DragonFly BSD, NetBSD, OpenBSD, OpenWrt, macOS, HP-UX 11i, and AIX.

Secure Shell

SSHSSH ClientSSH logs
OpenSSH is based on the original SSH.
Both are commonly present on most modern operating systems, including macOS, most distributions of GNU/Linux, OpenBSD, FreeBSD, NetBSD, Solaris and OpenVMS.

C standard library

libcstandard librarystandard C library
Android uses its C standard library, LLVM uses its regular expression library, and Windows 10 uses OpenSSH with LibreSSL.
BSD libc is a superset of the POSIX standard library used by BSD operating systems such as FreeBSD, NetBSD, OpenBSD and macOS.

Sndio

sndio, a compact audio and MIDI framework
sndio is the software layer of the OpenBSD operating system that manages sound cards and MIDI ports.

OpenNTPD

OpenNTPD, a simpler alternative to ntp.org's NTP daemon
OpenNTPD is primarily developed by Henning Brauer as part of the OpenBSD project.