Freeware: Prtg

PRTG - Paessler Router Traffic Grapher 6.2.1.950An 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.

Paessler Netflow Tester 1.1Paessler Netflow Tester is a free program that simply dumps the data of all Netflow packets that a computer receives from a Cisco router. This can be useful when debugging bandwidth monitoring configurations based on Cisco's Netflow protocol.

Paessler SNMP Tester 2.2Test and debug SNMP requests with Paessler SNMP Tester for free. Run simple SNMP requests against a device in your network, testing each single step of the SNMP request as it is logged into a logfile for analysis.

Paessler WMI Tester 2.0.1Paessler WMI Tester is a tool for quickly and easily testing the accessibility of WMI counters. "Windows Management Instrumentation" is the latest technology from Microsoft for monitoring and managing Windows based systems.

Paessler SNMP Tester 3.0Test and debug SNMP requests with Paessler SNMP Tester for free. Run simple SNMP requests against a device in your network, testing each single step of the SNMP request as it is logged into a logfile for analysis.