1)   PRTG - Paessler Router Traffic Grapher 5.2.0.581
An easy to use Windows solution that monitors and classifies bandwidth and network usage. The software supports SNMP, packet sniffing and netflow to generate live readings and trend data to optimize the efficiency of your network components.
SNMP, packet sniffer, packet sniffing, netflow, cisco, router, firewall, mrtg, bandwidth, usage,