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

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

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

Squash AUTOM is a set of tools and plugins designed to industrialize the automation process and the execution of automated test campaigns. The proposed features also allow you to adopt best practices to facilitate and secure your automation project.

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

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