BitMeter OS keeps track of how much you use your internet/network connection, and allows you to view this information in a variety of ways.Discontinued
Cannot install version 0.8.0 experimental or 0.7.6 stable on Monterey: "The package is incompatible with this version of macOS. The package is trying to install content to the system volume"
BitMeter OS vs NetSpeedMonitor opinions
Does not include taskbar info feature
Smart Traffic Meter is a Linux network usage monitor. The program shows real-time graphs and reports. Smart Traffic Meter runs as a system daemon and displays all information in a web user interface accessible through a web browser.