Open source Statistical tools for Windows

gretl

gretl is a cross-platform software package for econometric analysis, written in the C programming language. (GPL)

Linux - FreeBSD - Windows - MAC OS X

PSPP

PSPP is a program for statistical analysis of sampled data. It is a free replacement for the proprietary program, SPSS. (GPL)

Linux - FreeBSD - Windows - MAC OS X

R

R is a language and environment for statistical computing and graphics. The R language is widely used among statisticians and data miners for developing statistical software and data analysis. (GPL)

Linux - FreeBSD - Windows - MAC OS X

Rattle

Rattle presents statistical and visual summaries of data, transforms data into forms that can be readily modelled, builds both unsupervised and supervised models from the data, presents the performance of models graphically, and scores new datasets. (GPL)

Linux - Windows - MAC OS X

RKWard

RKWard aims to become an easy to use, transparent frontend to R, a powerful system for statistical computation and graphics. This software tries to combine the power of the R-language with the ease of use of commercial statistical packages. (GPL)

Linux - FreeBSD - Windows

RStudio

RStudio is a new integrated development environment (IDE) for R. RStudio combines an intuitive user interface with powerful coding tools to help you get the most out of R. (AGPL)

Linux - Windows - MAC OS X

6 applications