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Here are 10 bandwidth monitoring tools that you can to monitor and manage bandwidth.

Real-Time Bandwidth Monitor polls your interface as frequently as every half second and reports realtime bandwidth usage on an easy-to-understand graph. Set critical and warning thresholds to instantly see when usage is out of bounds. 

It is useful in network troubleshooting, development of communication and software protocol, analysis and education. This is a multiplatform application that uses widget toolkit from GTK+ in its latest releases, as well as Qt in development versions toexecute its UI and utilizing pcap in packet capturing.

This application evaluates bandwidth usage on the installed computer. Bandwidth Monitor displays actual download as well as upload speeds both in numerical and graphical forms, registers bandwidth usage, as well as offering weekly, monthly, and daily bandwidth usage reports. This tool evaluates every network connection on computers like LAN network, VPN connection and Internet network.

This is free and simple, yet potent tool that assists you evaluate objectively the situation of your bandwidth. You may use Network to gather data on bandwidth usage and measure your internet speed or other connections in the network. The tool can assist you identify probable sources of problems in a network, make sure you never exceed bandwidth limits set by the ISP or tracking suspicious network activities characterized by Trojan horses as well as hacker attacks.

This is the GUI front end in Nuttcp. The easy to use tool is useful in testing network performance that has GUI. 

Cacti is a complete RRDToolbased graphing solution. It stores all of the necessary information to create graphs and populate them with data in a MySQL database. The frontend is completely PHP driven. Along with being able to maintain Graphs, Data Sources, and Round Robin Archives in a database, Cacti handles the data gathering. There is also SNMP support for those used to creating traffic graphs with MRTG

BandwidthD tracks usage of TCP/IP network subnets and builds HTML files with graphs to display utilization. Charts are built by individual IP. 

MasterShaper is a network traffic shaper which provides a Web Interface for Quality of Service (QoS) functions of newer Linux 2.4- & 2.6- Kernel-Serie. It provides a Web Interface which lets you define bandwidth pipes and filters (based on IP, MAC, ports, protocols, ipp2p, layer7-filter.

PRTG Network Monitor runs on a Windows machine within your network, collecting various statistics from the machines, software, and devices which you designate.

Squid Analysis Report Generator is a tool that allow you to view “where” your users are going to on the Internet. Sarg generate HTML reports, with informations about users, IP Addresses, bytes, sites and times.