Here in the states, Turbo Linux is used for high end applications like clustering. FreeBSD makes an ideal Internet or intranet server. It provides robust network services, even under the heaviest of loads, and uses memory efficiently to maintain good response times for hundreds, or even thousands, of simultaneous user processes. I like OpenBSD because it seems to be one of the most secure Free Unix like operating systems by default. It boasts of only having one hole in two years.
Several versions are available.
The second is YDL Gone Home, which is the version for the home or small office. I am sure there are some more distributions. I would love to add it to the list.