Monitor multiple Servers Performance

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http://serverfault.com – In my company there are 5 servers, each one of them is running on different OS such as Linux, Red Hat, Windows, and Mac OS Server. So my question is, is there a way to monitor performances and utilise the Internet connectivity of all servers at just one computer? I mean something to collect the information of all server and report it in one page or even email? Is there any software that be so cross platform? (HowTos)