I'm using the free and open source statistical computing
software called R. I am an Engineer/Statistician/Operations Research specialist by trade. If you are curious more about R and data mining analytics you can check out a couple of my sites.
IEOR Tools Online Store. I have a category dedicated to R programming there.
Also my
IEOR Tools blog where I frequently talk about R and other analytics.
If anyone is curious about getting started with R I strongly suggest looking at one of my posts on
beginner R.