Apple Xgrid 1.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application lies within System Tools, more precisely General. We recommend checking the downloaded files with any free antivirus.
From the developer:
Apple Xgrid... Imagine waking up one day to find your Mac has solved a vexing scientific problem. While the cure to cancer, super-efficient solar power and ending world hunger are a ways off, you can combine your computing resources using Xgrid
You may want to check out more Mac applications, such as Apple Configurator or Apple Remote Desktop, which might be related to Apple Xgrid.
Puzzle