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

HyperTest is a no-code test automation tool that regresses all your APIs by auto-generating integration tests using your network traffic, also giving a way to reproduce these failures inside actual user-journeys.

Fully integrated API and web service testing capabilities that automate end-to-end functional API testing.

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.

Selenium automates browsers. That's it! What you do with that power is entirely up to you.