Postman - The Collaboration Platform for API Development
LambdaTest - Perform Web Testing on 2000+ Browsers & OS
Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.
RainforestQA - Insanely simple testing. Create tests for your website in plain English, then run them across all major browsers with a single click. Powered by human intelligence
TestComplete - TestComplete Desktop, Web, and Mobile helps you create repeatable and accurate automated tests across multiple devices, platforms, and environments easily and quickly.
Appium - Appium is an open source test automation framework for use with native and hybrid mobile apps.