Nobodys DataQualityTools (en) - Version 4.04 DataQualityTools is a collection of tools to help businesses improve the quality of their databases. The central components are a series of functions which help to find duplicate records (deduplication software) and, above all, a function for error-tolerant doublet search based on postal addresses. This allows you, in the case of direct marketing, to avoid double solicitations and the redundant maintenance of customer addresses and other records.