mGstat 0.995 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 software lies within Education Tools, more precisely Science. We recommend checking the downloaded files with any free antivirus. The actual developer of this free Mac application is Thomas Mejer Hansen.
From the developer:
mGstat aims to be a geostatistical toolbox for Matlab. Simple kriging, ordinary kriging and Universal/Kriging with a trend are available. All methods support data observations in ND-space. Thus, for example, Time-Space kriging can be used.
Synthetic semivariogram can be calculated using both GSLIB and GSTAT syntax. Experimental semivariograms can be calculated from data observations.
You may want to check out more software for Mac, such as Genealogy Pro, sciatrope or Curvus Pro X, which might be related to mGstat.