jsdom - A JavaScript implementation of various web standards, for use with Node.js - jsdom/jsdom
Selenium - Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that.
puppeteer - Puppeteer is a Node library which provides a high-level API to control headless Chrome or Chromium...
Phantomjs - PhantomJS is a headless browser that works hand in hand with Selenium to help developers more efficiently test their sites and apps.
Puppet Master - Headless Chrome as a service
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.