Web Load Speed Test - Test your website load speed from 6 locations at once
Global Website Speed Test - Test website load speed from 18 cities, including 3 in China
Speedtest by Ookla - Measure your ISP's performance in a click
Loader.io - Loader.io is a simple cloud-based load testing service
speedtest-cli - Test your download speed using SpeedTest on the command-line
LoadFocus - Cloud Testing Infrastructure | Cloud Testing Services and Tools for Websites & APIs.