flow-based IP traffic analysis and visualization tool

 FlowScan is a freely-available network traffic analysis and
 visualization tool which uses IP flow data to provide a continuous
 near real-time view of a network's IP traffic.
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 FlowScan is a tool to monitor and graph flow information from Cisco
 and Riverstone routers in near real-time. You can also use FlowScan
 with flow information generated by programs like fprobe.