SikuliX
Now continued as OculiX — see oculix.org
...SikuliX (and now OculiX) automates anything you see on the screen of your desktop computer.
Running Windows, Mac or some Linux/Unix. It uses image recognition powered by OpenCV to identify GUI components and can act on them with mouse and keyboard actions.
This is handy in cases when there is no easy access to a GUI's internals or the source code of the application or web page you want to act on.
This SourceForge entry is preserved for historical reference.
Please get the latest version from https://github.com/oculix-org/Oculix/releases.