Charles is a HTTP proxy that enables you to see traffic between your machine and the backend

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.

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

Playwright enables reliable end-to-end testing for modern web apps.

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

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