Easy-IP - IPAM and DNS for Telecoms
Zabbix - Track, record, alert and visualize performance and availability of IT resources
nChronos - NPMD key player, provides network analysis, monitoring, diagnosis and troubleshooting solutions for network performance improvement and network forensics.
NetVizura NetFlow Analyzer - NetFlow Analyzer is a solution for bandwidth monitoring and traffic analysis. It helps with traffic investigation, analysis and reporting
NetDecision - Network Monitoring
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.