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.
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.
Currencies - An exchange rates currency converter for Android
Denomination - Currency converter that tells you the change you need for that conversion