Requestly is an open-source tool that simplifies API development, testing, mocking, and integration for developers and QAs.

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.

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

Charles is a HTTP proxy that enables you to see traffic between your machine and the backend

Puppeteer is a Node.js library which provides a high-level API to control Chrome/Chromium over the DevTools Protocol.

Streamline your API testing, integration testing and test data management.