Voiden is a developer-first API client with local storage, Git-integrated, all based on markdown + offline support.

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

RapidAPI for Mac is a full-featured HTTP client that lets you test and describe the APIs you build or consume. It has a beautiful native macOS interface to compose requests, inspect server responses, generate client code and export API definitions.

API Testing Platform that automatically generates unit test cases with dependency mocks from API calls

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.

Simplifies performance and load testing so that application delivery teams can take a standardized approach to ensure continuous performance, reliability, and scalability from development to production.