FlowViewer
FlowViewer is a web-based netflow data analysis tool.
...The FlowViewer tools provide additional graphing and tracking features by utilizing open source software including Thomas Boutrell’s gd, Lincoln Stein's GD, Martien Verbruggen's GD::Graph, and Tobias Oetiker’s RRDtool.
FlowViewer v4.6 fixes non-UTC local time environments for FlowViewer and FlowGrapher, and $no_devices_or_exporters FlowMonitor_Collector problem.
**Note: SiLK must be v3.8.0 or later. Version 3.9 handles sFlow data.