Is there software that includes post hoc tests for nonparametric data?

Hello all,

I have used the Kruskal-Wallis nonparametric test to identify if there are differences among groups. The p-value was 0, meaning there are differences. Now I want to use post hoc test to see which group differ form which. The conditions are:
a. Comparison of means of 7 to 12 groups.
b. Unequal Ns
c. nonparametric data

My questions are:
1. What is the most appropriate post hoc analysis test for these conditions?
Nonparametric Bonferroni-Dunn
Mann-Whitney U Test

2. I cannot find any statistic software that has one or more of those tests. Do you guys know one?

3. Is there any alternative in case I cannot have access to software? I have a total of 150 data points.

Thanks you very much,