Efficient management of Bandwidth is necessary in avoiding network congestion that can result in poor network performance. The technology offered by open source framework has great tools capable of assisting you manage properly the bandwidth in your network.
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Solarwinds
This Network performance monitor allows you quick detection, diagnosis and resolution of network performance issues and outage – prior to receiving calls requesting whether network is down. This is the simplest product in its category to deploy, maintain, and exploit. This points out that you can utilize your time essentially managing the network instead of supporting the network performance monitoring software.
ManageEngine OpManager
This is a data and network infrastructure management application that assists huge enterprises, SME and service providers manage data centers as well as IT infrastructure cost effectively and efficiently. Intelligent warning engines, automated workflows, extendable templates and configurable discovery algorithms allow IT teams configure 24×7 system of monitoring within hours after installation.
Wireshark
This open source and free tool is a packet analyzer. Wireshark 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 to execute its UI and utilizing pcap in packet capturing.
Bandwidth Monitor
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.
NetWorx
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.
Nuttcp-Cygwin-GUI
This is the GUI front end in Nuttcp. The easy to use tool is useful in testing network performance that has GUI.
I would add Anturis in your list. This is a cloud-based all in one monitoring tool mostly for small companies, but with excellent troubleshooting options which makes it possible to use it even by people who are not experts at all. The tool uses an agent which penetrates everywhere and monitors how the network works and in case of any slightest problem the tool alerts the admin and offers the troubleshooting for it.