- Cacti
Cacti is an open-source, web-based network monitoring and graphing tool designed as a frontend application. With Cacti, you can monitor and graph CPU load, network bandwidth utilization, network traffic monitoring, and more. However, this software primarily uses industry-standard data logging RRD tools.
Official website: http://www.cacti.net/
- Nagios
This network monitoring tool is also excellent and can be used to constantly check and maintain critical systems to ensure the normal operation of applications and services. Nagios is an open-source network monitoring software that can monitor and alert servers and all applications. In short, it is a powerful network monitoring tool.
Official website: http://www.nagios.org/
- Munin
Munin is a network resource monitoring tool that helps businesses analyze the latest research trends. It is somewhat similar to Cacti. The software provides results through a web interface using simple graphics. Munin helps system administrators monitor the performance of computers, networks, and applications.
Official website: http://munin-monitoring.org/
- Microsoft Network Monitor
This tool allows you to capture, view, and analyze network traffic. Microsoft Network Monitor is simple and fast to use. It provides nearly 300 public and Microsoft proprietary protocols. After launching the tool, you need to select an adapter from the main window, then click "new chapter" to start a new capture option, and then set the capture options. You can also view and change corresponding filtering options, adapter options, and global settings.
Official website: http://www.microsoft.com/en-us/download/details.aspx?id=4865
- BandwidthD
BandwidthD can monitor the usage of TCP/IP networks and display the data it collects on charts from different time periods. BandwidthD can run completely in the background. Its installation process is also easy, just download WINCAP version 3.0 or above.
Official website: http://sourceforge.net/projects/bandwidthd/
- PRTG Network Monitor Freeware
This is another popular network monitoring tool. It monitors network availability through various protocols, including SNMP, NetFlow, and WMI. It is a very powerful tool that allows the use of web-based interfaces and applications for iOS and Android. Additionally, it is worth recommending because it can also create HTML/PDF format reports, which is very convenient.
Official website: http://www.paessler.com/prtg
- Easy Net Monitor
This is a very lightweight tool that can ensure its normal operation whether it is locally or remotely hosted. Easy Net Monitor is popular because it does not require installation, you can simply download and use this free service. When you start Easy Net Monitor, you can see its icon in the notification area of your desktop.
Official website: http://nicekit.com/net-monitor/best-free-net-monitor.htm