OpenBSD项目提供了一份免费、多平台的、基于4.4 BSD的UNIX操作系统。我们的成就在于强调其可移植性、标准化、正确性、安全性以及集成的密码应用技术。OpenBSD支持大多数SVR4（如 Solaris）程序的二进制仿真，也支持FreeBSD、Linux、BSD/OS、SunOS和HP-UX程序。OpenBSD可从我们的FTP站点免费获得，也可以通过并不昂贵的三CD套装获得。
Theo de Raadt has announced the release of OpenBSD 4.4, a BSD operating system with a strict security philosophy and advanced security features: "We are pleased to announce the official release of OpenBSD 4.4. This is our 24th release on CD-ROM (and 25th via FTP). We remain proud of OpenBSD's record of more than ten years with only two remote holes in the default install. As in our previous releases, 4.4 provides significant improvements, including new features, in nearly all areas of the system: new or extended platforms for sparc64, socppc, landisk; improved hardware support; new tools and functionality; assorted improvements and code cleanup; install and upgrade process changes; OpenSSH 5.1; over 4,500 ports, minor robustness improvements in package tools (Firefox 3, GNOME 2.20.3, Inkscape 0.46, KDE 3.5.8, OpenOffice.org 2.4.1, Xfce 4.4.2...." Read the release announcement and release information for a detailed list of changes and improvements. Download: i386/install44.iso (216MB, MD5), amd64/install44.iso (236MB, MD5).