If space-squads, emperors, dungeon-masters, planets, starships and space wars are your thing, you've probably heard of VGA Planets. It's a popular play by email, space strategy game created in 1991, and Planets Nu is the online browser based version launched in 2011. Planets Nu now provides the Planets Nu API, which is good news for developers who want to programmatically access the game's functionality.
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.