Some of the more common packages used are Systat, SPSS, and SAS. They differ in multiple ways, at least some of which are ease of use, generality, and cost. There are many possible statistical programs that can be used in psychological research. Get the definitive Introduction to R written by members of the R Core Team. In addition, a short guide to data analysis in a research methods course offers some more detail on graphing.
(For two very abbreviated, and very out of date, forms of this guide meant to help students do basic data analysis in a personality research course, see a very short guide.
Much of material has also covered been covered in number of short courses or in a set of tutorials for specific problems. This is one page of a series of tutorials for using R in psychological research. Using R for psychological research A simple guide to an elegant language
