Since R offers similar features than S-PLUS, a larger number of additional libraries (more than 300!), and is totally free, it is clearly an excellent choice for statistical analyses. This benchmark shows also that it is also quite good for "number crunching". Moreover, it runs on almost all platforms (Windows, Macintosh, Unix/Linux) and it has not the "loop problem" of S-PLUS (yet it also provides apply() and the like to accelerate loops). However, it does not propose (yet) the same nice user interface with menus and dialog boxes (GUI) as S-PLUS 6.1 does,... (though many professionals do not care about that because they prefer to use scripts and the command line for a finer control on their calculations). R becomes better and better with the successive releases. It is maintained and enriched by a very active community of developers. These are the reasons why we decided to promote it as a reference in our benchmark tests.