I would not say GNU Octave is an alternative. GNU PSPP really is (although it is a free clone of SPSS, not SAS). Gretl too (especially if the software is mainly use for regression). Real statisticians use GNU R (a programming language, with gazillions of modules for anything pertaining to statistics). I teach "Applied Data Mining" with KNIME (hundreds of nodes, a nice GUI, etc.). The CERN (crunching really a lot of data) uses the ROOT system. There are *many* good free software applications for statistics and data mining.

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