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.

An open source JS tool for image analysis and comparison. A successor of PhantomCSS.

The Apache JMeter™ application is open source software, a 100% pure Java application designed to load test functional behavior and measure performance. It was originally designed for testing Web Applications but has since expanded to other test functions.

Test, scrape, generate, and automate without the pain and expense of hosting your own headless browsers.

API Testing Platform that automatically generates unit test cases with dependency mocks from API calls

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