Zabbix - Track, record, alert and visualize performance and availability of IT resources
SolarWinds Netflow Traffic Analyzer - Identify how bandwidth is being used with NetFlow Traffic Analyzer for SolarWinds Network Performance Monitor. Download free 30-day analyzer software trial!
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.
FastNetMon - FastNetMon is a very fast DDoS analyzer with sflow/netflow/mirror support.
ManageEngine NetFlow Analyzer - Bandwidth management made easy - Get the best combination of network traffic analysis and control
Observium - Observium