Download of GGobi 1.0 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Education Tools, more precisely Science.
This free software for Mac OS X was originally developed by The GGobi Foundation. 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 most popular versions of the software are 2.1 and 1.0.
From the developer:
GGobi is an open source visualization program for exploring high-dimensional data. It provides highly dynamic and interactive graphics such as tours, as well as familiar graphics such as the scatterplot, barchart and parallel coordinates plots. Plots are interactive and linked with brushing and identification.
You may want to check out more Mac applications, such as Arcade Math Blocks, Genealogy Pro or Analytics to Earth, which might be similar to GGobi.