Free/Open-source Statistical Software

If you are looking for a computer program that can help you get the results of standard statistical procedures and statistical significance tests without the need for low-level numerical programming, then a statistical package is what you need.

A statistical package is a suite of computer programs that are specialized for statistical analysis. Most statistical packages also provide facilities for data management. Statistical software is both available commercially and for free. However, I can only recommend those that are free and open source not only for the reason that it comes without a price tag, but also because it has the same quality as most of those that are proprietary.

I have here a list of some of the most known Free and Open source statistical packages as a guide to those who are looking for one: