DragonFly是一份作为FreeBSD-4.x系列在逻辑上的延续而设计的操作系统及应用环境。这些操作系统与Linux可归为相同的类别，因为它们都基于UNIX理念及应用程序接口。DragonFly是这条发展道路上的一个分支，可以说，是给了BSD一个向着不同于FreeBSD-5系列的崭新方向而发展的机会。

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        Matthew Dillon has announced the release of DragonFly BSD 2.2.1, a BSD operating system originally forked from FreeBSD 4: "The new 2.2 release includes Hammer, a file system that includes instant crash recovery, multi-volume file systems, data integrity checking, fine grained history retention, and the ability to mirror data to other volumes. It has undergone extensive stress-testing and is considered production-ready!" Other changes include: "Fixes for libthread_xu: MAP_STACK and an errno leak; fixed an installworld failure due to kernel fixes and a libthread_xu issue; installer now works correctly in the console, and properly creates device files if they don't exist; updates for msdosfs, pax(1), and magic(3); allowed uid/gid/flags changes to fail if running cpdup as a user...." Read the full release notes for additional details. Download (MD5): dfly-2.2.1_REL.iso.gz (184MB), dfly-gui-2.2.1_REL.iso.gz (516MB).（责任编辑：A6）