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According to respondents of the 2010 Rexer Analytics Data Miner Survey, open source R is the most commonly-used analysis tool amongst data miners:

After a steady rise across the past few years, the open source data mining software R overtook other tools to become the tool used by more data miners (43%) than any other. STATISTICA, which has also been climbing in the rankings, is selected as the primary data mining tool by the most data miners (18%). Data miners report using an average of 4.6 software tools overall. STATISTICA, IBM SPSS Modeler, and R received the strongest satisfaction ratings in both 2010 and 2009.

The complete survey results are available free of charge from Rexer. Details at the link below.

Rexer Analytics: 2010 Data Miner Survey Results