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

One test framework, for ALL your apps Maestro is a single platform that tests all of your mobile and web apps - no matter what framework your team uses.

Puppeteer is a Node.js library which provides a high-level API to control Chrome/Chromium over the DevTools Protocol.

Browser and Mobile Automation Test Framework for Node.js

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.

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.