Mockoon is the easiest and quickest way to design and run mock REST APIs.

Free & OpenSource REST API Testing Tool for all levels in a Test Pyramid

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

YATTIE exists to help make tester's lives easier. Ideally, it should remove friction from the exploratory testing process - everywhere from gathering evidence to submitting reports.

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

Cloud-scale performance testing. Effortless load testing and synthetic checks at scale. Cloud-native and open-source. The next evolution of performance testing.