Percy is a visual testing and monitoring tool that focuses on detecting visual changes in web applications

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

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.

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.

Hand-crafted lightweight Rest Client for testing APIs. Supports collections, environments, git collaboration and local storage.