Some developers don't just love code that runs--they also like to get out and run, themselves. And, because they're developers, they love to collect statistics and track their progress over time. If you're one of those people, good news: online service MyFitnessPal has provided the MyFitnessPal API to help its users bring together all their data from various devices and apps in a single place.
FantasyData.com, NFL statistical data provider, offers the FantasyData NFL API. The API gives developers access to NFL data (e.g. team stats, live scores, season information, box scores, and more). The API targets web and mobile app owners who develop apps for the fantasy football market. Many of the most popular fantasy football apps have already integrated with FantasyData's APIs.