extlib_lite is a super lightweight alternative to activesupport or extlib. It contains some of the usual friends such as pluralize, singularize, classify, and constantize without the overhead of its big brothers. I take no credit for extlib_lite, I simply extracted the code from activesupport and extlib.
Currently extlib_lite supports the following functions
gem install extlib_lite require 'extlib_lite'
Copyright (c) 2010 David Wilkie, released under the MIT license