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Zabbix - Track, record, alert and visualize performance and availability of IT resources
FastNetMon - FastNetMon is a very fast DDoS analyzer with sflow/netflow/mirror support.
Servers Alive - Servers Alive is an end-to-end network monitoring tool running on Windows 2003/2008/XP/Vista/7.
Abusix - Abusix is a network security company that offers email threat protection and network abuse handling solutions to ISPs, Telcos, and Cloud/Hosting Providers to stop the rapidly growing problem of email-borne threats and other kinds of network abuse.
Observium - Observium
SolarWinds NPM - Advanced network monitoring for on-premises, hybrid, and cloud. Download a FREE 30-day trial of SolarWinds Network Performance Monitor (NPM) today!