Testing and validating REST services in Java is harder than in dynamic languages such as Ruby and Groovy. REST Assured brings the simplicity of using these languages into the Java domain.

Testing or Automating User Interfaces? Save 93% of your time, building tests or automations that run on any platform

Healenium is an open-source library for automated testing that uses machine learning to improve the reliability of your tests. It can automatically detect and heal test failures caused by changes in the UI, such as element IDs or class names.

Appium is an open-source project and ecosystem of related software, designed to facilitate UI automation of many app platforms

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.

Hoppscotch is an open-source API development ecosystem that helps you create and test your API requests saving precious time in development.