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

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

Swagger UI allows anyone — be it your development team or your end consumers — to visualize and interact with the API’s resources without having any of the implementation logic in place

Testing and validating REST services in Java is harder than in dynamic languages such as Ruby and Groovy. REST Assured brings the simplicity of using these languages into the Java domain.

Jest is a delightful JavaScript Testing Framework with a focus on simplicity.

Hoppscotch is an open-source API development ecosystem that helps you create and test your API requests saving precious time in development.