Netflow Tools

NFdump - Back-end netflow collector that receives netflow from your routers
NFsen - Web-based front-end to NFdump, used to view graphs and run queries
Fprobe - Allows a server to generate netflow based on the traffic to an interface An extensive list of open-source and commercial Netflow software
MangeEngine NetFlow Analyzer - NetFlow collector to visualize netflow exports

Links

http://www.switch.ch/tf-tant/floma/software.html
Ubuntu Network Management Tools