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A language and environment for statistical computing and graphics. R is similar to the award-winning S system, which was developed at Bell Laboratories by John Chambers et al. It provides a wide variety of statistical and graphical techniques (linear and nonlinear modelling, statistical tests, time series analysis, classification, clustering, ...). R is designed as a true computer language with control-flow constructions for iteration and alternation, and it allows users to add additional functionality by defining new functions. For computationally intensive tasks, C, C++ and Fortran code can be linked and called at run time.
Apart from specific innovations in R itself (see the official R-2.0.1 announcement) this new build provides a major update of the new Cocoa GUI for R. Among these: configurable external editor, full drag and drop implementation, new preference panes, deeper system integration, fixes of many bugs including symbol fonts handling for the Quartz graphics device, non necessary CPU consumption, file dialogs weirdness. This version of the GUI requires Mac OS X 10.3+, 10.2+ user can still use R-2.0.0 with the old carbon GUI (the new build contains installers for both Mac OS X 10.2+ and 10.3+).