Dshell is a network forensic analysis framework
edit and replay captured network traffic
FlowViewer is a web-based netflow data analysis tool.
free netflow analyzer
NetFlow iptables module for Linux kernel
TCP and UDP network buffer
Buffers, forwards, and splits flow data including NetFlow and IPFIX
Netflow visualisation and investigation tool
NfSen plugin to generate and analyze per-IP statistics
Various TCP/IP servers, clients and network management tools
netflow collecting and processing tools
Dashboard of network top-talkers using netflow sources