This public domain Common Lisp implementation of Soundex was originally in the JWZ tarball of the CMU AI repository.
Soundex is ASDF-installable.
Download ASDF package from http://abstractnonsense.com/soundex-1.0.tgz
levenshtein also measures the distances between words, although it is not based on sound.
This page is linked from: Levenshtein
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