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.
AutoHotkey - The ultimate automation scripting language for Windows.
TestComplete - TestComplete Desktop, Web, and Mobile helps you create repeatable and accurate automated tests across multiple devices, platforms, and environments easily and quickly.
Pulover’s Macro Creator - Pulover’s Macro Creator is a Free Automation Tool and Script Generator.
Katalon - Built on the top of Selenium and Appium, Katalon Studio is a free and powerful automated testing tool for web testing, mobile testing, and API testing.
AutoKey - A Python 3 port of AutoKey, the desktop automation utility for Linux and X11.