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

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

Robot Framework is a generic open source automation framework. It can be used for test automation and robotic process automation (RPA).

A modern, resource-friendly REST client for Windows 10

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.

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.