Gregory Piatetsky-Shapiro answers:
There are many commercial and open-source packages (see
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:
Third Annual Rexer Analytics Data Miner Survey, examined the behaviors, preferences and views of 710 data miners.
Second Annual Rexer Analytics Data Miner Survey, examined the behaviors, preferences and views of 348 data miners
How to Choose a Data Mining Suite,
by Robert Nisbet, DM Review, March 2004.
Data Mining Tools: Which One is Best For CRM?,
by Robert Nisbet, DM Review, January 2006.
A Survey of Data Mining software Tools, by Michael Goebel and Le Gruenwald,
SIGKDD Explorations, June 1999. Volume 1, Issue 1