For people that care about security, I would add those monitoring tools: -OSSEC - log + file system security monitoring (http://ossec.net http://ossec.net) -S

For people that care about security, I would add those monitoring tools: -OSSEC - log + file system security monitoring (http://ossec.net http://ossec.net) -Snort - Network-based IDS (http://snort.org http://snort.org) -Sucuri (not free) - web site monitoring (http://sucuri.net http://sucuri.net)