Freeware Collector and Reporting
Is a step by step process to build a detailed Network Usage Reports using RRDTool, flow-tools, FlowScan, and CUFlow.
Freeware Collector Software
Flow-tools Reporting GUI
Freeware NetFlow collector that support v5, v7 and v9. Supports IPv4 and IPv6 flows.
Open source tools that report NetFlow data
NetFlow Monitor (NF) is tool for processing and evaluating NetFlow Exports from Cisco routers.
NTop is an opensource tool that provide network visibility and by leveraging packet captures and NetFlow information.
NetFlow Collector and analyzer solution
Free tool for remotely and quickly configuring NetFlow v5 via SNMP on supported Cisco devices.
NetFlow Reporting Solution