NetBSD是一份免费的、安全的及高度可移植的开源UNIX操作系统，它适合于很多种平台，从64-bit的AlphaServers及桌面系统到手持 及嵌入式系统。它在设计上非常整洁，并拥有先进的特性，这使得它在业界和学术界都有口皆碑。用户可通过完整的源代码来获得支持。很多应用程序都可容易地从 NetBSD Packages Collection获得。
Geert Hendrickx announced the availability of the official release of NetBSD 4.0: "Major achievements in NetBSD 4.0 include support for version 3 of the Xen virtual machine monitor, Bluetooth, many new device drivers and embedded platforms based on ARM, PowerPC and MIPS CPUs. New network services include iSCSI target (server) code and an implementation of the Common Address Redundancy Protocol. Also, system security was further enhanced with restrictions of mprotect(2) to enforce W^X policies, the Kernel Authorization framework, and improvements of the Veriexec file integrity subsystem, which can be used to harden the system against Trojan horses and virus attacks." See the release announcement and the complete list of changes for more information. ISO images for a variety of architectures are available from the NetBSD mirrors; quick links to the i386 and x86_64 CD images: i386cd-4.0.iso (242MB, MD5), amd64cd-4.0.iso (166MB, MD5). Torrent files are available here.
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