Datadog is a cloud-based monitoring and analytics platform that provides observability and security for cloud-scale applications

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.

Professional software tool for HTTP testing and debugging

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

Design, debug, and test APIs locally or in the cloud

Code, test, and deploy synthetic monitoring at scale.