Downloading Xgrid 1.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The following version: 1.0 is the most frequently downloaded one by the program users. The actual developer of this free Mac application is Apple Inc. Xgrid for Mac relates to Business Tools.
From the developer:
Apple’s Xgrid technology makes it easy to turn an ad hoc group of Mac systems into a low-cost supercomputer. Leveraging the power of Mac OS X Server, Xgrid is an ideal distributed computing platform for individual researchers, specialized collaborators, and application developers.
You may want to check out more software for Mac, such as Remote Activity, which might be similar to Xgrid.