Bruno is a Fast and Git-Friendly Opensource API client, aimed at revolutionizing the status quo represented by Postman, Insomnia and similar tools out there.

Selenium automates browsers. That's it! What you do with that power is entirely up to you.

Requestly is an open-source tool that simplifies API development, testing, mocking, and integration for developers and QAs.

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.

A browser extension and Ruby gem to improve the debugging experience when testing Rails applications

Sonic is a platform that integrates remote control debugging and automated testing of mobile devices, and strives to create a better user experience for global developers and test engineers.