This add-in allows you to performs the Games-Howell test for one nominal/ordinal group variable and one continuous response. Games-Howell is an adjustmet to the Tukey HSD procedure to adjust the error degrees of freedom to account for unequal variances.
Output is similar to Fit Y by X output for the Tukey HSD procedure, which includes the Tukey HSD threshold matrix, Connecting Letters Report, and the Ordered Differences Report. Sample output using Weight vs. Position from the Football sample data set is shown below:
If you get a lot of value from the add-in, please let me know in the comments. If there is sufficient interest, I will work on adding support for multiple X and Y variables, By variables, Weight, etc.