iPerf3 - iPerf3 is a simple tool that measures Internet bandwidth.
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
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...
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
TamoSoft Throughput Test - TamoSoft Throughput Test is a utility for testing the performance of a wireless or wired network.
Better Uptime - We call you when your website goes down