Are There Data Mining Tool Comparisons?

Gregory Piatetsky-Shapiro answers:
I maintain a comprehensive list of data mining tools / software at

I have been running annual polls on Data Mining Software Usage, which, while not perfect, offer some measure of tool popularity. Here are some recent KDnuggets polls on Data Mining Tools:

Gartner periodically publishes a "Magic Quadrant" which covers data mining. Here is