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

API Testing Platform that automatically generates unit test cases with dependency mocks from API calls

Easy-to-use website monitoring and uptime monitoring service in one

Browser and Mobile Automation Test Framework for Node.js

Real API Design-first Development Platform Design. Debug. Test. Document. Mock. Build APIs Faster & Together.

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.