R is a one-of-a-kind statistical programming language. It was developed in New Zealand at the University of Auckland and has since been adopted by many academics and professionals around the world. It is well known for providing a free, open source alternative to SPSS(Statistical Package for the Social Sciences) and in many ways is more flexible and powerful with many free modules available online to perform a wide variety of tasks.
You can download the latest version for any operating system here.
A series of introductory workshops on using R to generate graphics can be found here, with the slides and data here. However they all require this package (ggplot2) to give your graphs a little ‘zing’. Another great introductory video covering similar material and using the same package is available here.
R can appear a little daunting at first, but there is a beautiful little ide (integrated development environment) for all major platforms here:
http://www.rstudio.org/ that we highly recommend to get you started!
There will be an R tutorial coming soon! Keep an eye on the MESA site for future updates.