XE.com - XE.com Inc. (XE) is a Canadian online foreign exchange services company.
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
xCurrency - Smart Currency - A simple ads-free currency converter.
Currencies - An exchange rates currency converter for Android
Yahoo! Finance - Currencies Center - Currency Converter from Yahoo! Finance.