ReadyAPI is a low-code API testing platform for development teams that care about creating test automation across any workflow.

Percy is a visual testing and monitoring tool that focuses on detecting visual changes in web applications

The Complete Continuous Testing Platform Any test. Any device. App quality without limits.

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

Burp or Burp Suite is a set of tools used for penetration testing of web applications. It is developed by a company named Portswigger who make freely available a Web Security Academy which has a range of lessons on penetration testing.

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