Zabbix - Track, record, alert and visualize performance and availability of IT resources
iperf - A TCP, UDP, and SCTP network bandwidth measurement tool
Paessler PRTG - An advanced network monitoring solution to monitor network up/downtime, traffic and usage.
JPerf - This project gives a better UI and new functionalities to the initial JPerf 1.
Observium - Observium
netperf - Netperf is a benchmark that can be used to measure the performance of many different types of networking. It provides tests for both unidirectional throughput, and end-to-end latency. - HewlettPack...