Currency Thingamajig offers a minimal UI to convert between 33 different currencies (listed below). It uses the European Central Bank as source, which updates daily.
AUD Australian Dollar
BGN Bulgarian Lev
BRL Brazilian Real
CAD Canadian Dollar
CHF Swiss Franc
CNY Chinese Yuan
CZK Czech Republic Koruna
DKK Danish Krone
EUR Euro
GBP British Pound Sterling
HKD Hong Kong Dollar
HRK Croatian Kuna
HUF Hungarian Forint
IDR Indonesian Rupiah
ILS Israeli New Sheqel
INR Indian Rupee
ISK Icelandic Króna
JPY Japanese Yen
KRW South Korean Won
MXN Mexican Peso
MYR Malaysian Ringgit
NOK Norwegian Krone
NZD New Zealand Dollar
PHP Philippine Peso
PLN Polish Zloty
RON Romanian Leu
RUB Russian Ruble
SEK Swedish Krona
SGD Singapore Dollar
THB Thai Baht
TRY Turkish Lira
USD United States Dollar
ZAR South African Rand
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