Software for string similarity calculation

Hi there,
I am looking for a Mac OSX software or an excel macro which calculates the Levenshtein (or Edit) Distance among strings.
Anyone can help?
Thanks in advance.

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python?

this looks promising
http://trific.ath.cx/resources/python/levenshtein/
-a

Thanks

I have never tried python. Hope I will be able to go thru this.
Thanks.