[ale] network management/corelation software

[jimpop at yahoo.com (Jim Popovitch)]

I'm very familiar with Nagios/Netsaint, and I work for a company that
produces commercial network management software.  What other open-source
network management applications exist that do basic "link-up/link-down"
correlation, notifications, as well as allow for some custom logic?

Tia,

-Jim P.