The official PlayFab Node.js SDK by PlayFab calls the Playfab REST API to access game backend services. Features include analytics, player accounts, and virtual goods. TLS v1.1 is needed to connect to the Playfab service.
At the The Next Web Hackathon in Amsterdam, developers played with a lot of new APIs. One that caught our attention is the Gbanga Puppetmaster API. Gbanga is a location-aware gaming platform, intended for use with games where walking around within the real world matter. It's released one game, Gbanga Famiglia, a mobile phone-based app using a theme of mafia families taking over areas and finding loot. Much more exciting, however, is its API, which allows for quests within Famiglia, and other, separate location-based games.
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.