The University Of Nottingham has created an Open Source standalone windows desktop application called OpenPseudonymiser.
The application allows users to pseudonymise datasets by creating a digest of one or more columns of a CSV file.

This site contains everything you need to get going including the desktop application, .NET assembly and JAR files for systems integration, test data, documentation and an area to generate encrypted salt codes.

The software has been released as open source for transparency and to facilitate its use within the NHS clinical computer systems though the tools on this website can be used with any dataset.

Organisations who wish to make use of the Open Pseudonymiser technology have full responsibility for regarding information governance and security considerations relevant to their purposes.