VisualDF version 2.0.2 (date 5.7.13)

VisualDF was created to provide a free, open-source program with an intuitive Excel interface to compute effect size indices of differential functioning of items and tests/scales. 

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Features: 

• Support for 1-3PL and GRM Models
• Prompt-driven set-up
• Open-source Visual Basic for Applications code
• Produces easily customizable graphs in Excel

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Citing VisualDF:  Meade, A. W. (2010). A taxonomy of differential functioning effect size indices. Journal of Applied Psychology, 95, 728-743.