PSPP
From IFORS Developing Countries Online Resources
GNU PSPP is a program for statistical analysis of sampled data. It is a free as in freedom replacement for the proprietary program SPSS, and appears very similar to it with a few exceptions.
Link to website: https://www.gnu.org/software/pspp/
- Up to date information about the software in this list, which is mostly free to use, can be obtained from this link