XE.com - XE.com Inc. (XE) is a Canadian online foreign exchange services company.
Yahoo! Finance - Currencies Center - Currency Converter from Yahoo! Finance.
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.
Elk - The fastest way to convert currencies on mobile.
xCurrency - Smart Currency - A simple ads-free currency converter.
Cocorate.com - Online currency and cryptocurrencies exchange rates calculator helps you convert anything in real-time.