cvs tools

For those who have to deal with cvs data files, here is a tool to do de-duplication 
 
 http://source.mozillaopennews.org/en-US/articles/introducing-cvsdedupe/ 	 https://github.com/datamade/csvdedupe 
 
 Here are tools for working with cvs files. http://csvkit.readthedocs.org/en/latest/ 
 Do you know of any others?