"I've already shared with you a list of some of the
best and most well-known Linux distributions used on web servers.
However, there are still plenty of excellent server-oriented Linux
distros that I failed to mention there. So I think it is important
to make a follow up post and bring you another round of Linux
distributions for web server.
Based on CentOS, ClearOS is a network and gateway server especially
made for small businesses and distributed environments. It offers a
comprehensive list of integrated services that are easy to
configure through its intuitive and user-friendly web-based
interface. ClearOS also features several essential tools and
modules that include antispam, antivirus, content filtering, VPN,
bandwidth manager, SSL certification, web log analyzer, etc. The
distribution is available as a free download including free
security updates for 18 months.
"EnGarde Secure Linux
EnGarde Secure Linux is a server-oriented distribution that offers
services like web, DNS, and the ability to email simply and
securely without the need for laborious 'hardening' "