Professional software tool for HTTP testing and debugging

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

Open-source framework for building Web Agents

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.

Test, scrape, generate, and automate without the pain and expense of hosting your own headless browsers.

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