Throttled Pro - Throttled Pro optimizes your internet connection and provides QoS (Quality of Service) to Mac OS X.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Ashampoo Internet Accelerator - Ashampoo Internet Accelerator is an internet connection optimizer and booster that allows you to tune your connection settings.
Observium - Observium
TcpView For Linux - TcpView For Linux. Touch screen friendly design graphical network connections viewer for Linux.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services