Webservers monitoring tool

I have serveral webservers. Does anyone know if there is a webbased tool for monitoring these servers. I want to know if smtp http ftp etc is down on one of the servers.

The software has to be webbased and must have to option to add users en give these users the option of adding their own servers.

All the servers are webservers based on linux (Red Hat, FreeBSD) and Windows (server 2003)

Please help!

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Lee W, MVPTechnology and Business Process AdvisorCommented:
There are several free systems monitoring tools, my last job used nagios.  There's also BigBrother and Big Sister.  Commercially, there are several packages - one that we tried and liked was "WhatsUp".

Big Brother:

Big Sister

What's Up

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Lee W, MVPTechnology and Business Process AdvisorCommented:
Forgot Nagios web site:
Also have a look at webstats:
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