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.

Real API Design-first Development Platform Design. Debug. Test. Document. Mock. Build APIs Faster & Together.

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

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

Hand-crafted lightweight Rest Client for testing APIs. Supports collections, environments, git collaboration and local storage.

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.