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.

Fake - Fake is a new browser for Mac OS X that makes web automation simple.

Watir - Watir stands for Web Application Testing In Ruby. It facilitates the writing of automated tests by mimicking the behavior of a user interacting with a website. CommunityWatir stands for Web Application Testing In Ruby.

Sahi - Sahi is an automation tool to test web applications.

Retest - Retest allows you to check your web apps user experience and deliver absolute masterpieces on multiple devices so that every time your customer visits your webpage, they feel what you want them to feel with your design irrespective of their device

BrowserBird - Low-Code browser automation builder | serverless puppeteer