DataCleaner is an Open Source application for data profiling, data validating and comparing data. This product is well documented with screen shots and makes an ideal tool to begin applying data profiling techniques.

Talend open profiler allows for the creation of business rules, patterns and indicators that can monitor data integrity.

Ideal for test preparation and set up DbUnit has the ability to export and import your database data to and from XML datasets. Since version 2.0, DbUnit can also work with very large datasets when used in streaming mode. DbUnit can also help you to verify that your database data match an expected set of values.