BrowserStack - BrowserStack is a software testing platform for developers to comprehensively test websites and mobile applications for quality.
Postman - The Collaboration Platform for API Development
Appium - Appium is an open source test automation framework for use with native and hybrid mobile apps.
Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.
LambdaTest - Perform Web Testing on 2000+ Browsers & OS
TestComplete - TestComplete Desktop, Web, and Mobile helps you create repeatable and accurate automated tests across multiple devices, platforms, and environments easily and quickly.