Sniffnet
7.4#4 in bandwidth monitoring softwareFree planFree planLinuxmacOSWindows
VisitNo prices published.
Sniffnet suits people who want to monitor network activity without relying on a complex analyzer. It also fits users who need capture filtering, host details, or alerts across Windows, macOS, or Linux.
You want what its maker publishes above — check its page for the details.