ConvertAll - A comprehensive unit conversion program.
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.
Converter NOW - A simple, immediate and fast unit converter!
Yahoo! Finance - Currencies Center - Currency Converter from Yahoo! Finance.
Currencies - An exchange rates currency converter for Android