With over 800 add‐on packages, many containing multiple procedures, R can do almost everything that SAS and SPSS can do and quite a bit more, plus that it is free! The table below focuses only on SAS and SPSS products and which of them have counterparts in R. As a result, some categories are extremely broad (e.g. regression) while others are quite narrow (e.g. conjoint). R packages that have no counterparts in the form of SAS Inc. or SPSS Inc. products are not listed. There are many important topics (e.g. mixed models, offered by all three) that are not listed because neither SAS nor SPSS sell a product focused just on that.
R.5.2.1 can be downloaded from http://www.r-project.org