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。
Matthew Dillon announced the availability of DragonFly BSD 2.0: "2.0 is our eighth major DragonFly release. DragonFly's policy is to only commit bug fixes to release branches." Changes in this release include: the HAMMER filesystem featuring crash recovery on-mount (without fsck) and queueless incremental mirroring, numerous kernel changes like native fairq-queue implementation and native connection state recovery, various hardware changes like added drivers and better USB survivability, userland changes like blacklist for weak Debian-generated SSH keys and improved manual pages and documentation, a lot of contributed software like new versions of BIND, OpenSSH, tnftpd, and GCC. Fortran was removed from the base system, along with other old stuff like legacy device drivers. See the rather brief release announcement and the detailed 2.0 release notes for more information. Download (MD5): dfly-2.0.0_REL.iso.gz (129MB, torrent).
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