Free & OpenSource REST API Testing Tool for all levels in a Test Pyramid

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.

Hoppscotch is an open-source API development ecosystem that helps you create and test your API requests saving precious time in development.

Test, scrape, generate, and automate without the pain and expense of hosting your own headless browsers.

Integrate systems. Automate work. Accelerate your digital transformation with a single platform for integration and business process automation.

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