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

Swagger UI allows anyone — be it your development team or your end consumers — to visualize and interact with the API’s resources without having any of the implementation logic in place

Selenium automates browsers. That's it! What you do with that power is entirely up to you.

Professional software tool for HTTP testing and debugging

Mockoon is the easiest and quickest way to design and run mock REST APIs.

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