NOAA National Weather Service alerts, predicts, and forecasts climate changes in the United States. This is a Ruby client library for NOAA created by developer Andrew M. Whalen. It contains data to interact with forecast and current weather conditions.
Google now has over 400 cities included in its transit service. That means each of those organization provides a feed so that the search giant can give accurate routing, schedules and fares. So, why isn't it easier for the average developer to access this data?
How far back do your newspaper's online archives go? The U.S. Library of Congress has a database of thousands of newspapers dating back to the 1800s. In the case of over 150 of the papers, there are also digitized, searchable pages. And it's all available via its new Chronicling America API (technical details at our Chronicling America API profile).