Selenium
Selenium automates browsers. That's it! What you do with that power is entirely up to you.
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Streamline your API testing, integration testing and test data management.
Making API testing more scalable and insight-driven for CI/CD, API-first and microservices success
Puppeteer is a Node.js library which provides a high-level API to control Chrome/Chromium over the DevTools Protocol.
Test, scrape, generate, and automate without the pain and expense of hosting your own headless browsers.
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.