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R is a free software environment for statistical computing and graphics. It compiles and runs on a wide variety of UNIX platforms, Windows and MacOS.
R studio is a free and open source IDE for R.
You can run it on the web using R studio server or You can work on any browser using your account (IITB LDAP) in optimus http://10.105.27.47:8787/. For using optimus server please add proxy exception.
More info at http://rstudio.org/