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.

End to End Automation testing for Dev/QA Teams

A modern, resource-friendly REST client for Windows 10

Unifying API testing, API Performance testing, API Mocks and UI testing.

Automated robustness testing at the UI level

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