CurrencyScoop - Developer-friendly REST API with real-time and historical currency exchange rates for world currencies and cryptocurrencies.
XE.com - XE.com Inc. (XE) is a Canadian online foreign exchange services company.
Denomination - Currency converter that tells you the change you need for that conversion
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.
Flip - Currency Converter - Flip is a simple and easy-to-use currency & exchange rate converter.
xCurrency - Smart Currency - A simple ads-free currency converter.