Burp or Burp Suite is a set of tools used for penetration testing of web applications. It is developed by a company named Portswigger who make freely available a Web Security Academy which has a range of lessons on penetration testing.

Browser and Mobile Automation Test Framework for Node.js

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.

A modern, resource-friendly REST client for Windows 10

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