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Python tool to analyze csv files:

Command line tool (one single file, no dependencies)
It reads and parse csv files
Perform statistical analysis to discover content and dependent cols
It can filter rows and cols using a simple but powerfule syntax
Can compute new columns
Can output text, html and other csv files
Everything can be scripted

Interpreting the Data: Parallel Analysis with Sawzall

data exchange format

ggplot2 is a plotting system for R, based on the grammar of graphics, which tries to take the good parts of base and lattice graphics and none of the bad parts.