Quoting Austad, Jay (austad at marketwatch.com):
>    Ok, Intermapper ([1]http://www.intermapper.com/) is probably one of
>    the most useful network monitoring tools I've ever used.  Except, it
>    only runs on Mac, and there are no plans to port it to another OS.  If
>    you have an extra Mac laying around, you should really grab a demo
>    copy and check it out.

OpenNMS?

http://www.opennms.org

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