Built for developers and testers alike, SoapUI is the only open source tool that covers the entire testing spectrum (functional, security, load, mocking).

Real API Design-first Development Platform Design. Debug. Test. Document. Mock. Build APIs Faster & Together.

Design, debug, and test APIs locally or in the cloud

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

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.

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