Stand-alone statistical power analysis software package that is used for the calculation of a sample size for a planned study.

Free software environment for statistical computing and graphics. It compiles and runs on a wide variety of UNIX platforms, Windows and MacOS.

Presents useful code and techniques to increase productivity of all level of SPSS users.

Provides analytical and statistical software tools and services.

Allows for analysis and distribution of statistical data over the internet.

Data mining, data analysis, quality control, and web analytics software.

Free time-series analysis software, using methods based on the theory of nonlinear deterministic dynamical systems.

Offers XPro, a specialized software providing many tools for data analysis by exact methods in numerous linear models.