Currencier is a currency-converter widget for OS X 10.10 Yosemite's Today panel!
It supports many languages.
Main window contains only widget settings and Tutorial. You can convert currencies in the notification center widget. Currency data automatically update from Yahoo Finance.
In order to install the widget in the notification center, enter it by clicking on the upper right corner. Then find the button “Edit” and click on it. In the list of widgets find “Currencer” and click on “+” opposite the widget’s name.
In order to change the widget click on “(i)” opposite the widget. You can add, delete or sort currencies.
Your Mac should to be connected to the Internet to show accurate information.
fixed rate source