The examples on the website don't necessarily do the tool justice, but it produces really beautiful output if you take the time to learn to use it, produces good output even if you don't, scales well to huge data sets, and the guy who writes it is incredibly sensitive to user feedback; when I've requested features, they've usually been available in a new beta inside of two days.
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DataGraph (http://www.visualdatatools.com/DataGraph/) is my personal favorite.
The examples on the website don't necessarily do the tool justice, but it produces really beautiful output if you take the time to learn to use it, produces good output even if you don't, scales well to huge data sets, and the guy who writes it is incredibly sensitive to user feedback; when I've requested features, they've usually been available in a new beta inside of two days.