Built for developers and testers alike, SoapUI is the only open source tool that covers the entire testing spectrum (functional, security, load, mocking).

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

Postman is an API platform for building and using APIs. Postman simplifies each step of the API lifecycle and streamlines collaboration so you can create better APIs—faster.

Free & OpenSource REST API Testing Tool for all levels in a Test Pyramid

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

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.