LoadFocus - Cloud Testing Infrastructure | Cloud Testing Services and Tools for Websites & APIs.
Postman - The Collaboration Platform for API Development
Loader.io - Loader.io is a simple cloud-based load testing service
StopLight - Stoplight is an API Design, Development, and Documentation platform that enables consistency, reusability, and quality in your API lifecycle, all with an easy, enjoyable developer experience.
Loadster - Loadster is a full-featured load testing solution for websites, web apps, and web services.
Mockoon - Mock servers in seconds