LoadFocus - Cloud Testing Infrastructure | Cloud Testing Services and Tools for Websites & APIs.
Loadster - Loadster is a full-featured load testing solution for websites, web apps, and web services.
Loader.io - Loader.io is a simple cloud-based load testing service
LoadForge - Better, cheaper load testing for websites, APIs and servers
LoadStorm - Load test websites, web apps, APIs, and mobile apps via the cloud. Use scripts to simulate user behavior for up to a million virtual users. Try it for free!
WebLOAD - WebLOAD - The most flexible and cost effective software for enterprise load, stress and performance testing, integrated with DevOps processes. Click for details