Methodologies, Toolkits and Software

A GNU project.  R is a language and environment for statistical computing and graphics. 

R provides a wide variety of statistical (linear and nonlinear modelling, classical statistical tests, time-series analysis, classification, clustering, …) and graphical techniques, and is highly extensible. 

The S language is often the vehicle of choice for research in statistical methodology, and R provides an Open Source route to participation in that activity.