XE.com - XE.com Inc. (XE) is a Canadian online foreign exchange services company.
CurrencyScoop - Developer-friendly REST API with real-time and historical currency exchange rates for world currencies and cryptocurrencies.
Yahoo! Finance - Currencies Center - Currency Converter from Yahoo! Finance.
Flip - Currency Converter - Flip is a simple and easy-to-use currency & exchange rate converter.
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.
exRate - exRate is a web application created to help users easily manage their exchange rate alerts.