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.

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

Use Espresso to write concise, beautiful, and reliable Android UI tests.

Mockoon is the easiest and quickest way to design and run mock REST APIs.

Professional software tool for HTTP testing and debugging

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