XE.com - XE.com Inc. (XE) is a Canadian online foreign exchange services company.
Cocorate.com - Online currency and cryptocurrencies exchange rates calculator helps you convert anything in real-time.
CurrencyScoop - Developer-friendly REST API with real-time and historical currency exchange rates for world currencies and cryptocurrencies.
Tweetbot - Sync your timeline across your iPhone, iPad, and Mac. Mute tweets by user, hashtag, tweet source, or keywords (including regex). 3rd Party support for image, video, read later, and timeline sync services.
Denomination - Currency converter that tells you the change you need for that conversion
Yahoo! Finance - Currencies Center - Currency Converter from Yahoo! Finance.