Suggest a system monitioring software package

[aragonx at dcsnow.com]

I'm looking for some system monitoring software.  In the past, I have
always heard Nagios referred to in a positive way.  This might be what I
need.  Let me define:

1)  Needs to run a shell script every 10 minutes or so and check the
return status.  If it fails, send a page.

2)  Have a web interface where system admins can see the status of the
servers.

3)  Have a button on the web page where system admins can run a script on
the server manually.

I think the 3rd requirement is the difficult one.

As always, I appreciate your help and value your input.  :)



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