R is a free statistical software package heavily influenced by S. It can be installed on Linux, Windows and MacOS.
http://cran.r-project.org/ - The R Software package.
http://www.rstudio.org - An improved Editor and Development Environment
R has the ability to incorporate many additional "packages" (over 3,300). It's recommended that you install the following packages to meet your coursework needs at NCSU. You may be introduced to additional R packages as you move into research.