Robot framework - Robot Framework is a generic test automation framework for acceptance testing and acceptance...
STAF - The Software Testing Automation Framework (STAF) is an open source, multi-platform, multi-language...
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.
PhearJS - Render any dynamic Javascript webpage to JSON with PhantomJS.
Screenster - 10x faster UI testing without a line of code.
TestComplete - TestComplete Desktop, Web, and Mobile helps you create repeatable and accurate automated tests across multiple devices, platforms, and environments easily and quickly.