pmacct is a small set of multi-purpose passive network monitoring tool
Enterprise Network Flow Collector (IPFIX, sFlow, Netflow)
FlowViewer is a web-based netflow data analysis tool.
ipt-netflow binaries for openwrt
NetFlow iptables module for Linux kernel
TCP and UDP network buffer
Buffers, forwards, and splits flow data including NetFlow and IPFIX
netflow collecting and processing tools
Master's Project for FECFRAMEWORK