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Review of Sikuli powered by the Slant community.
SikuliX is written in Java and automates anything on the screen using image recognition powered by OpenCV.
Read article Getting Started with the SikuliX IDE.
SpecsUpdate
PlatformsWindows, Linux, Mac
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Cons
Con Not so good for Windows OS
On Windows OS, better to use other tools like AutoHotkey or AutoIt.