Collaboration company 37Signals bought the popular Ember iPhone app, which uses the company's Campfire API (our Campfire API profile) to display and update chats. The app has been renamed 37Signals Campfire and is now available for free (previously $9.99).
The OpenRates API exchanges rate and converts currency in real time. Access the latest rates, historical rates, and base currency. You can learn how to access live data in this tutorial. Go back to the archives because the Rates API offers historical exchange rates beginning in 1999.