JASP is an open-source statistics program that is free, friendly, and flexible. Armed with an easy-to-use GUI, JASP allows both classical and Bayesian analyses.
PSPP is a program for statistical analysis of sampled data. It is a Free replacement for the proprietary program SPSS, and appears very similar to it with a few exceptions.
A. Bühl. Pearson Studium, München AND Boston AND San Francisco AND Harlow, England AND Don Mills, Ontario AND Sydney AND Mexico City AND Madrid AND Amsterdam, 12., aktualisierte Auflage edition, (2010)
R. Hatzinger, and H. Nagel. Pearson Studium, Müchen AND Boston AND San Francisco AND Harlow, England AND Don Mills, Ontario AND Syndney, AND Mexico City AND Madrid AND Amsterdam, (2009)