R is a free software environment for statistical computing and graphics. It compiles and runs on a wide variety of UNIX platforms, Windows and MacOS.
GUIDES & SUPPORT
Quick-R (made by Robert Kabacoff), is a R introduction site. It covers data management, basic and advanced statistics, and graphing in R. It is aimed at beginners as well at an audience that has previous experience using other packages (such as SAS or Stata).
R-bloggers is blog aggregator of content contributed by bloggers who write about R (in English). The site helps R bloggers and users to connect and follow the “R blogosphere”. You can find information for beginner and the more advanced user of R. On the web site they have collected some tutorials for learning R.
Video tutorials for R:
a YouTube playlist with tutorials on how to use R