Webminstats is a Webmin’s module which display a graphical log of historic information. It’s modular in design, as to be able to log everything from CPU usage to email box size.

A passive network sniffer/packet capturing tool for Windows with a great user interface. It can detect OS’s, sessions, hostnames, open ports etc. without putting any traffic on the network. NetworkMiner can also parse PCAP files for off-line analysis.

Traffic Prioritizer is designed to run on a linux router and prioritize users’ traffic by their bandwidth consumption. It is aimed to shape the “bandwidth greedy” clients (p2p,youtube,IPTV) so that the ones who are just browsing do not lack bandwidth.

nfdump is a set of tools to collect and process netflow data. It’s fast and has a powerful filter pcap like syntax. Nfdump supports netflow versions v5, v7 and v9 as well as a limited set of sflow and is IPv6 compatible

TraffStats - is a monitoring and traffic analysis software, using SNMP to collect data from any enabled device. - has the ability to generate graphs (using jpgraph) with the option to compare and sum up different devices.