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

Mockoon is the easiest and quickest way to design and run mock REST APIs.

Integrate systems. Automate work. Accelerate your digital transformation with a single platform for integration and business process automation.

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

Browser and Mobile Automation Test Framework for Node.js

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.