unac is a C library and command that removes accents from a string. For instance the string été will become ete. It provides a command line interface that removes accents from a input flow or a string given in argument (unaccent command).
This package is what I would consider to be extremely stable. Even though the project was somewhat abandoned in the 2002-2004 timeframe, Debian has continued to ensure the package works. The formula gets the code and patches from them, then makes local patches in order to compile properly under Mac OS.