R is a computer language not entirely unlike the S language developed at AT&T Bell Laboratories by Rick Becker, John Chambers and Allan Wilks. The two languages are implemented quite differently, but bear enough superficial resemblence that users should be able to switch between the two with relative ease. Currently the software is undergoing active development. Discussion of the development process is carried out on the "r-devel" mailing list. See the resources page for details on how to subscribe to this list.
We have implemented R in what we hope is a very portable fashion and in way which requires relatively little in the way of machine resources. Implementations exist for many for many members of the Unix family of operating systems, including AIX, FreeBSD, GNU/Linux, HPUX, Irix, MacOS X, Solaris, and Tru64. In addition there is a version for Microsoft Windows (9x, ME, NT4, 2000, XP) and one for MacOS 8.5-9.1.