Paessler Netflow Tester
Paessler Netflow Tester 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. First the Netflow protocol must be enabled and configured on the router. ... Each line shows the time, netflow version, number of flows and the IP of a packet (note: You need netflow version 5 for PRTG Traffic Grapher! ... Then the router must be given the IP address of the computer running Netflow tester so that the UDP data packets with Netflow data are sent to that computer.
http://download2.paessler.com/download/netflowtester.zip - 381Kb - Download - Screenshot

UTM for Windows
UTM (Universal Traffic Manager) is a professional billing system for Internet Service Providers. The core of the system, written in C++, is a smart and reliable accounting engine working directly with network equipment. It supports up to 100,000 users at a total speed of up to 3 Gbps. ... UTM receives statistics about running network traffic in NetFlow format among others. ... ) - dial-up connections (including prepaid cards) - hotspot - e-mail & web hosting - POTS - VoIP Security: - VPN support - IP-MAC Control - Automatic Firewall Management Supported Operating Systems: Windows (NT,...
http://www.netup.biz/demo_downloads/utm5-1.10.016-win-demo.zip - 16Mb - Download - Screenshot

PRTG - Paessler Router Traffic Grapher
PRTG Traffic Grapher is an easy to use Windows application for monitoring and classifying bandwidth usage. It provides system administrators with live readings and long-term usage trends for their network devices. PRTG is mainly used for bandwidth usage monitoring, but may also be used to... NetFlow: The NetFlow protocol is supported by most Cisco routers to measure bandwidth usage. ... For remote access PRTG Traffic Grapher comes with a built-in web server to provide access to graphs and tables.
http://download2.paessler.com/download/prtg.zip - 10Mb - Download - Screenshot