What software is available for data mining?

Gregory Piatetsky-Shapiro answers:

There are many commercial and open-source packages (see KDnuggets: Software).

Software suites are most popular. They generally offer many methods, including classification, clustering, and data preparation.

Specialized data mining software is also available for

KDnuggets was running annual polls on Data Mining Software Usage, which offer some measure of tool popularity -- here is the 2009 KDnuggets Data Mining Tools Used poll.

There are several surveys of data mining tools: