Downloading Sikuli 1.0 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The following version: 1.0 is the most frequently downloaded one by the program users. The common filename for the program's installer is Sikuli-IDE.exe. We recommend checking the downloaded files with any free antivirus. This free tool was originally produced by Sikuli Development Team. Sikuli is included in Development Tools.
From the developer:
Sikuli is a visual technology to automate and test graphical user interfaces (GUI) using images (screenshots). Sikuli includes Sikuli Script, a visual scripting API for Jython, and Sikuli IDE, an integrated development environment for writing visual scripts with screenshots easily. Sikuli Script automates anything you see on the screen without internal API's support.
You may want to check out more software, such as GnuWin32: LibIconv, SpinnerDemo or Greatis Form Designer.Net, which might be similar to Sikuli.