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.

Automate API workflows. Chain HTTP requests. Validate. Zero code.

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

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.

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

Fully integrated API and web service testing capabilities that automate end-to-end functional API testing.