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SGems from Standford also free

CTECH EVS 3D Volumetrics Geostatistics, Sampling and more GSTAT Plus 2D Geostatistics program

for sure, Arcgis already have Geostatistic, but I think its not enough for you, ehehehehehe I will name all the software , here you go : Geo-EAS (free) GSLIB: Geostatistical Software Library (free) GS+ - from Gamma Design Software Gstat - geostatistical modeling, prediction, and simulation SpaceStat - from TerraSeer S+SpatialStats Module - from Insightful Matlab and Fortran software for spatial lattice regression models (free) PASSaGE: Pattern Analysis, Spatial Statistics and Geographic Exegesis okay