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
Loadium - Performance Testing & Load Testing Tool
Speedtest by Ookla - Measure your ISP's performance in a click
Blazemeter - BlazeMeter is a self- service performance load testing cloud tool
Loader.io - Loader.io is a simple cloud-based load testing service