Currency models currencies, monetary values, foreign exchanges rates. Pulls live and historical rates from http://xe.com/, http://newyorkfed.org/, http://thefinancials.com/. Can store/retrieve historical rate data from database using ActiveRecord. Can store/retrieve Money values using ActiveRecord. For more details, see: http://rubyforge.org/projects/currency/ http://currency.rubyforge.org/ http://currency.rubyforge.org/files/README_txt.html