AutoIt is a scripting language that runs on Windows. It can be used to script a variety of actions. It uses a BASIC-like syntax and provides a large library of windowing, string, browsing and math functions functions. It provides the ability to insert/extract character strings and mouse motions/clicks in Windows applications. The documentation is somewhat lacking, but there is a relatively large following in the forums.
AutoIt can be used to automate just about any Windows task. It is however limited to Microsoft Windows operating systems.