DNA Test Profile Index calculations?

I would like to find an online DNA Profile relationship software that can do various relationship index calculations, including avuncular, sibship, parentage, etc. I've seen the bayesian equations they use, which are not so complicated, but the problem comes in with the probability of that length of allelle loci variable which comes from databases of individuals combined into ethnic groups. I've found a few calculators, but all the results of index calculation are different. Is there a free tool out there where you can plug in your results against others profiles and just calcualte various indices using large forensic databases? I feel this should be free in public domain. I found one calculator on a chinese university site, but it looks like thier database is not very robust, also i have no idea what the calculated index/result means.

I paid for one test, now I need to get another profile tested and put into it and I don't want to pay for another full test, just to do this calcuation. Perhaps there is a dna testing company out there that would just run the numbers if i provide the data?