These free statistics software for Windows are mainly stand-alone, with a few exceptions like Regressit, which is an Excel add-in.
Dataplot is a free, public-domain, multi-platform (Unix, Linux, Mac OS X, Windows XP/VISTA/7/8/10) software system for scientific visualization, statistical analysis, and non-linear modeling.
Develve is statistical software for fast and easy interpretation of experimental data in science and R&D in a technical environment.
G*Power is a tool to compute statistical power analyses for many different t tests, F tests, χ2 tests,z tests and some exact tests.
jamovi is a new statistical spreadsheet, designed from the ground up to be easy to use and is built on top of the R statistical language.
JASP is an open-source project with an intuitive interface and offers standard analysis procedures in both their classical and Bayesian form.
MacAnova is a free, open source, interactive statistical analysis program for Windows, Macintosh, and Linux
MaxStat is a easy to use and affordable statistics software. The Lite version is even free to use for non-commercial purpose.
NIMBLE lets users write statistical models in the BUGS language from R
PSPP is a free program for statistical analysis of sampled data. It is similar to SPSS with a few exceptions.
R is a free software environment for statistical computing and graphics. It compiles and runs on a wide variety of UNIX platforms, Windows and MacOS.
RegressIt is a PC Excel add-in that performs multivariate descriptive data analysis and multiple linear regression analysis with presentation-quality output in native Excel format.
Salstat is a sophisticated product widely used in business, sciences, and R&D.
Smith’s Statistical Package is a very user-friendly statistics program. The program is saved as a self-extracting condensed file that will open automatically.
SOFA is a user-friendly statistics, analysis, & reporting program. It is free, with an emphasis on ease of use, learn as you go, and beautiful output.
Statistical Lab is an explorative and interactive tool designed both to support education in statistics and provide a tool for the simulation and solution of statistical problems.
Statistics101 is a giftware computer program that interprets and executes the simple but powerful “Resampling Stats” programming language.
Zelig is an easy-to-use, free, open source, general purpose statistics program for estimating, interpreting, and presenting results from any statistical method.