Next-Generation Intrusion Prevention System (NGIPS) - Cisco Firepower NGIPS (Next-Generation IPS) provides contextual awareness, security intelligence, and advanced threat protection against attacks and malware.
NetVizura NetFlow Analyzer - NetFlow Analyzer is a solution for bandwidth monitoring and traffic analysis. It helps with traffic investigation, analysis and reporting
snort - Snort is a free and open source network intrusion prevention system.
Nfsen - NfSen is a graphical web based front end for the nfdump netflow tools that allows you to:
Suricata - Suricata is a high performance Network IDS, IPS and Network Security Monitoring engine.
Zabbix - Track, record, alert and visualize performance and availability of IT resources