Pulover’s Macro Creator - Pulover’s Macro Creator is a Free Automation Tool and Script Generator.
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.
AutoKey - A Python 3 port of AutoKey, the desktop automation utility for Linux and X11.
Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.
Hammerspoon - This is a tool for powerful automation of OS X.
Browsershots - Browsershots makes screenshots of your web design in different browsers.