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.
Uier - Codeless or low-code User Experience test editing and management using Selenium to perform testing...
Webinject - WebInject is a free tool for automated testing of web applications and web services.
Screenster - 10x faster UI testing without a line of code.
Pincers - Web Automation API that runs on top of WebDriver
SlimerJS - A scriptable web browser for web testing, web scraping, network monitoring...