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.
Cypress.io - Slow, difficult and unreliable testing for anything that runs in a browser. Install Cypress in seconds and take the pain out of front-end testing.
Phantomjs - PhantomJS is a headless browser that works hand in hand with Selenium to help developers more efficiently test their sites and apps.
puppeteer - Puppeteer is a Node library which provides a high-level API to control headless Chrome or Chromium...
Screenster - 10x faster UI testing without a line of code.
Webinject - WebInject is a free tool for automated testing of web applications and web services.