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

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

Fast, easy and reliable testing for anything that runs in a browser, Cypress is the new standard in front-end testing that every developer and QA engineer needs.

End-to-End Testing & Debugging powered by OpenTelemetry

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.