What are some alternatives?
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
Zabbix - Track, record, alert and visualize performance and availability of IT resources
BitMeter OS - An open-source bandwidth meter with a sophisticated web interface, available for Windows, Linux and Mac OSX
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
NetWorx - NetWorx is a simple and powerful tool that helps you objectively evaluate your bandwidth situation.
Icinga - Icinga is a fork of Nagios and is backward compatible.