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===NetBSD===
[[NetBSD]] aims to provide a freely redistributable operating system that professionals, hobbyists, and researchers can use in any manner they wish. The main focus is [[software portability|portability]], through the use of clear distinctions between machine-dependent and machine-independent code. It runs on a wide variety of 32-bit and 64-bit processor architectures and hardware platforms, and is intended to interoperate well with other operating systems.
NetBSD places emphasis on correct design, well-written code, stability, and efficiency, where practical, close compliance with open API and protocol standards is also aimed for Several security features are available in NetBSD<ref>{{cite web|url=http://netbsd.gw.com/cgi-bin/man-cgi?security+8+NetBSD-current|title=NetBSD security(8) manual page}}</ref>, including IPsec, a homegrown firewall [[NPF (firewall)|(NPF)]], a file integrity system [[Veriexec | (Veriexec)]], a kernel authorization framework (kauth) <ref>{{cite web |url=https://man.netbsd.org/kauth.9 |title=kauth(9) |work=NetBSD Manual Pages |date=10 August 2009 |access-date=8 February 2025}}</ref>, disk encryption (CGD), and a number of exploit mitigations like W^X, ASLR and PaX Segvguard.
In June 2008, the NetBSD Foundation moved to a two-clause BSD license, citing changes at UCB and industry applicability.<ref>{{cite web | date = 2006-01-08 | url = http://www.netbsd.org/Misc/about.html | title = About the NetBSD Project – What is the NetBSD project? | publisher = The NetBSD Foundation, Inc. | access-date = 2006-04-22}}</ref>
Projects spawned by NetBSD include [[NPF (firewall)|NPF]], [[Rump kernel | Rump kernels ]] and NVMM. <ref>{{cite web |url=https://blog.netbsd.org/tnf/entry/from_zero_to_nvmm |title=From Zero to NVMM| date=2019-04-09 |access-date=2025-01-06}}</ref>
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