FreeBSD is a UN*X-like operating system for the amd 64 platforms based on U.C. Berkeley's "4.4BSD-Lite" release, with some "4.4BSD-Lite2" enhancements. FreeBSD is used by companies, Internet Service Providers, researchers, computer professionals, students and home users all over the world in their work, education and recreation.
7.0 has been released: "The FreeBSD Release Engineering Team is pleased to announce the availability of FreeBSD 7.0-RELEASE. This is the first release from the 7-STABLE branch which introduces many new features along with many improvements to functionality present in the earlier branches.
Some of the highlights: dramatic improvements in performance and SMP scalability shown by various database and other benchmarks; the ULE scheduler is vastly improved, providing improved performance and interactive response; experimental support for Sun's ZFS file system; gjournal can be used to set up journaled file systems, gvirstor can be used as a virtualized storage provider; read-only support for the XFS file system; the Unionfs file system has been fixed...." Read the release announcement and release notes for further details.