Originally built from source long-lost to the mists of time, only closest reference I can find is here: http://fossies.org/linux/Neos/Packages/Framework/TYPO3.Kickstart/Resources/Private/PHP/Sho_Inflect.php

Original Readme below:

Thanks to

• http://www.eval.ca/articles/php-pluralize (MIT license)
• http://dev.rubyonrails.org/browser/trunk/activesupport/lib/active_support/inflections.rb (MIT license)
• http://www.fortunecity.com/bally/durrus/153/gramch13.html
• http://www2.gsu.edu/~wwwesl/egw/crump.htm