R / r-project

r-project

R is a language and environment for statistical computing and graphics.

www.r-project.org

http://r4stats.com/2014/08/20/r-passes-spss-in-scholarly-use-stata-growing-rapidly/

http://www.computerworld.com/s/article/9250542/R_programming_language_gains_on_traditional_statistics_packages?source=rss_latest_content