Jest is a delightful JavaScript Testing Framework with a focus on simplicity.

REST API client library for .NET

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

ReadyAPI is a low-code API testing platform for development teams that care about creating test automation across any workflow.

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

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.