What are some alternatives?
When comparing AutoIt and AutoHotkey, you can also consider the following products
Sikuli - Sikuli Script
TinyTask - TinyTask provides quick and easy automation by recording-playback.
Listary - Listary is a revolutionary search utility for Windows
WinAutomation - WinAutomation is the leading Windows automation software available today. Macro Recorder, Web Recorder and an advanced Task Scheduler wrapped into one.
Hammerspoon - This is a tool for powerful automation of OS X.
Cygwin - Cygwin is a set of tools that provide Linux and POSIX functionality to Windows.