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

ReadyAPI is a low-code API testing platform for development teams that care about creating test automation across any workflow.

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.

Design, debug, and test APIs locally or in the cloud

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