R is a language and environment for statistical computing and graphics. It is probably correct to say that R is THE most widely used statistical analysis and programming environment in higher education, and is gaining coinsiderable favour in the commercial world. R is designed around a true computer language, allowing users to add functionality by defining new functions. Over 4,000 packages are avilable from CRAN, many of which have been submitted by academics who have used the capabilities of R to help them in their own fields of research.

If you are looking for a tool to do some analysis of a dataset, R probably has a pcakage available on CRAN that can do the job with little or no modifcation. If no suitable package is available - create one!

Please see this thread:
http://boards.openpandora.org/index.php/topic/13393-r-with-gui/page-2#entry256131
for further details of this release.