Free Prestashop Modules

This module allows your store to manage inventory in one currency, and sell in another. For example your default currency is Euros, but you want to sell your products to the USA, in Dollars. So add US Dollars as a currency to your shop, then install this module and configure US Dollars as the forced currency. Even if you have the Currency Block module installed, your customers will not be able to select another currency. Your currency in the Back Office will remain the default currency, Euros, in this example.

Download this module here

This is a module that will create a block with dropdown menus for language and currency options.

Read about it here