DU Meter is a network monitoring and bandwidth monitoring application that provides information about the data transmission and connection times statistics that will help you monitor what is happening at every moment in your network and alert you of dangerous or unexpected network activity.
This application takes up minimal system resources and is small. It displays a ton of different information about your network.
It not only contains a visual, graphical representation of current network usage in the main window, but it also records this data and can display statistical information about how much network resources are being used.
DU Meter offers a fully functional 30-day free trial.