The official Stormpath Java SDK by Stormpath calls the Stormpath REST API which provides developers with a user management infrastructure. Features include authentication, schema-less user data and social media login with Facebook and Google OAuth. It requires Maven 3.2.1 and JDK 7 to build.
Windows Phone 8.1 adds compelling user-facing features, but it's a bit of a mystery just how much developers will be able to take advantage of them. The revised smartphone operating system from Microsoft will hit the street as soon as May in new hardware, and will be distributed to existing handsets by the summer months.