FreeBSD 7
By Rayed
FreeBSD 7 is available, many new improvements performance and feature wise, check the announcement.
One of the most impressive improvements is SMP (Symmetric multiprocessing):
Dramatic improvements in performance and SMP scalability shown by various database and other benchmarks, in some cases showing peak performance improvements as high as 350% over FreeBSD 6.X under normal loads and 1500% at high loads. When compared with the best performing Linux kernel (2.6.22 or 2.6.24) performance is 15% better
Update: OnLamp has a nice article about the amazing FreeBSD 7: What’s New in FreeBSD 7.0