Lots of information about foreign currency exchange. Convert between any two currencies. For example, you can determine how many Yen, Pounds, or Krone you can get for your Dollar, Peso, or Franc. Find the conversion rate for any day or range of days from January 1990 through yesterday. There are also links to a large number of currency trading information sites.

Open Access

https://www1.oanda.com/currency/converter/

A collection of financial calculators including their Universal Currency Converter for converting more than 180 world currencies in to any other world currencies and a Credit Card Charges Calculator that it will give you an estimate of the “hidden” charges the credit card issuer is adding on for converting the foreign exchange and processing the transaction.

Open Access

https://www.xe.com/