unduplo   
by vi-host   

This tool cleans doubles or duplicates in databases, lists, spreadsheets etc.
import your data in Unduplo
You ask Unduplo to clean up the list...
Unduplo shows the doubles
You can export your data to the original format or a new (csv, dbf, xls, excel..., tab) to use the cleaned list in your databases, spreadsheets or texts