NetBSD, well-known for its high portability has arrived at version 5, which has been worked on for about 2 year. This release seems pretty interesting from a performance point of view. It’s claimed that NetBSD 5.0 now outruns NetBSD 4, FreeBSD 7.1 and Fedora 10.
In addition to scalability and performance improvements, a significant number of major features have been added. Some highlights are: a preview of metadata journaling for FFS file systems (known as WAPBL, Write Ahead Physical Block Logging), the ‘jemalloc’ memory allocator, the X.Org X11 distribution instead of XFree86 on a number of ports, the Power Management Framework, ACPI suspend/resume support on many laptops, write support for UDF file systems, the Automated Testing Framework, the Runnable Userspace Meta Program framework, Xen 3.3 support for both i386 and amd64, POSIX message queues and asynchronous I/O, and many new hardware device drivers. [source]
OpenBSD, renowned for its focus on security (incl OpenSSH), has released version 4.5. The latest version comes with improved hardware support, new tools and functionalities and upgraded ports.
Oh yeah, and there’s also a new release song.
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!
7.2 review: improved virtualisation (nixcraft)