Puppeteer is a Node.js library which provides a high-level API to control Chrome/Chromium over the DevTools Protocol.

Robot Framework is a generic open source automation framework. It can be used for test automation and robotic process automation (RPA).

Playwright enables reliable end-to-end testing for modern web apps.

Postman is an API platform for building and using APIs. Postman simplifies each step of the API lifecycle and streamlines collaboration so you can create better APIs—faster.

Mock and modify HTTP request for exploratory testing.

Professional software tool for HTTP testing and debugging