Users of the French Linguistics site may be interested in the Currency Quoter tool, of which an update was released today. The tool is designed for those who operate with different currencies and need to convert between them frequently, for example in order to quote prices to their clients in other currencies.
As well as converting amounts at the current exchange, the program allows you to view previous exchange rates and calculate currency exchanges at historic rates. It also includes a feature to display the likely range of values that a particular currency exchange will have in the future. This feature is designed to be useful when billing in a particular currency, to help decide how much the value billed will actually be worth when it is paid at the term of the invoice.