Probably the best-known is Nagios. I would start there to determine if it fits the bill. If it doesn't, check the Nagios forums -- there will probably be discussions of other management tools there that will point you to more candidates.
Dig Deeper on Linux servers
Related Q&A from Bernard Golden
Expert Bernard Golden answers a question regarding best practices for Xen. Continue Reading
An open source software and applications expert says that Red Hat has nothing to fear from free Linux distros; reliability and certainty are the ... Continue Reading
An open source software and applications expert explains where Red Hat's code falls in the scheme of open source versus proprietary. Continue Reading