ManageEngine NetFlow Analyzer – FREE TRIAL A comprehensive bandwidth monitor with a free edition that is limited to two interfaces.Paessler PRTG – FREE TRIAL A collection of system monitors that includes a packet sniffer tool and is free for up to 100 sensors.Site24x7 Network Monitoring – FREE TRIAL A network performance and traffic monitoring system that is delivered from the cloud.SolarWinds Traffic Analyzer – EDITOR'S CHOICE This package of network monitoring and management tools tracks traffic patterns on the network and on VMWare vSphere implementations.Here is our list of the Top Free NetFlow Analyzers and Collectors: NetFlow analyzers allow you to pinpoint machines and devices that are hogging bandwidth, to find bottlenecks in your system, and, ultimately, to improve your network’s overall efficiency. NetFlow Analyzers and Collectors are very useful tools to assist in monitoring and analyzing network traffic data to help you manage these issues and potentially stop them before they become major problems.

So the question then comes: what is NetFlow and what are Network Analyzers? This is where analyzing network traffic comes in handy using packet sniffing techniques. As Network engineers and Administrators, many of us are consistently dealing with issues that aren't always as apparent as they seem.

Netflow monitoring tools