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.

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

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

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

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

Professional software tool for HTTP testing and debugging