Two of the most popular currency conversion tools are Oanda.com and XE.com. Both services also feature a downloadable application for mobile devices. Oanda and XE are listed on the IRS website as trusted currency conversion and market tools.
Oanda.com provides many useful tools within the website such as historical exchange rates, foreign market analysis, and conversion calculators. Oanda also offers a currency conversion and Forex trading application for iPhone, Android and Blackberry devices.
XE.com provides the same information as Oanda with applications for iPhone, Android, Blackberry and Windows devices. XE.com also allows the option of transferring money with currency exchanges to other locations abroad such as family or foreign bank accounts.