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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.
Webinject - WebInject is a free tool for automated testing of web applications and web services.
SlimerJS - A scriptable web browser for web testing, web scraping, network monitoring...
Screenster - 10x faster UI testing without a line of code.
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.
UBot Studio - Ubot Studio allows you to make ANY automation software you want without ANY programming experience.