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

The Complete Continuous Testing Platform Any test. Any device. App quality without limits.

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

Unifying API testing, API Performance testing, API Mocks and UI testing.

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.

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.