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Re:Ask HN: Good tool to visualize data? by kalendae on Sunday November 08, 2009 @06:01PM (#929976)
R http://www.r-project.org/ i would consider it to have a high learning curve tho.
Re:Ask HN: Good tool to visualize data? by hazexp on Sunday November 08, 2009 @09:52PM (#930283)
I personally didn't find the learning curve to be that high. Perhaps because I was in a course learning taught by one of the founders of the R Project ;).

The lecture slides he created were great, and I recommend anyone that is interested in R to have a look at them: http://www.stat.auckland.ac.nz/~stat380/?Lecture_Slides