R

R is an integrated suite of software facilities for data manipulation, calculation and graphical display. Among other things it has:

• an effective data handling and storage facility
• a suite of operators for calculations on arrays, in particular matrices
• a large, coherent, integrated collection of intermediate tools for data analysis
• graphical facilities for data analysis and display either directly at the computer or on hardcopy
• a well developed, simple and effective programming language (called `S') which includes conditionals, loops, user defined recursive functions and input and output facilities. (Indeed most of the system supplied functions are themselves written in the S language.)

The term “environment” is intended to characterize it as a fully planned and coherent system, rather than an incremental accretion of very specific and inflexible tools, as is frequently the case with other data analysis software.

From: R Core Team 

Platform: Unix, Windows and Mac OSX (Classic no longer supported)

Cost: Free

See: http://cran.r-project.org/

Fields