The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. Our efforts emphasize portability, standardization, correctness, proactive security and integrated cryptography.
OpenBSD is freely available from our FTP sites, and also available in an inexpensive 3-CD set.
The current release is OpenBSD 5.1 which was released May 1, 2012.
OpenBSD is developed entirely by volunteers. The project pays for the development environment and developer events by selling CDs through a collection of stores and by accepting donations from organizations and individuals. These finances ensure that OpenBSD will continue to exist, and will remain free for everyone to use and reuse as they see fit. T-shirts and posters are available as well.
OpenBSD是一个从NetBSD衍生出来的类Unix操作系统。专案领导人希欧·德若特(Theo De Raadt)在1995年发起了OpenBSD专案，希望创造一个注重安全的操作系统，此外OpenBSD也以高品质的文件、坚持开放程式码以及严格的软体授权著名。OpenBSD的吉祥物是刺豚。
OpenBSD包含了一些在其他操作系统缺少或是选择性的安全功能，此外OpenBSD极度重视程式码的品质，任何对核心的修改都需要经过严格的审查。OpenBSD可以在17种不同的硬体环境下运作，包含DEC Alpha、Intel i386、Hewlett-Packard PA-RISC、AMD64、Motorola 68000、PowerPC、Sun SPARC等。
5.1版本：2012年5月2日（目前最新版），该版本更新的软件包括：OpenSSH 6.0, GNOME 3.2.1, KDE 3.5.10, Xfce 4.8.3, MySQL 5.1.60, PostgreSQL 9.1.2, Postfix 2.8.8, Mozilla Firefox 3.5.19, 3.6.25 and 9.0.1, LibreOffice 3.4.5.2等。
关于OpenBSD更多信息，下载等等请关注其主页。
OpenBSD项目主页：http://openbsd.org/
Getting the OpenBSD distribution：http://openbsd.org/ftp.html