Scribe Java is a code library that enables developers to interact with the LinkedIn OAuth API. It also supports OAuth 1.0a and 2.0 for other popular APIs, such as Facebook, Twitter, Evernote, and Vimeo.
LoginRadius, a leading software as a service (SaaS) provider of social infrastructure, has announced the addition of "Login with Amazon" to the LoginRadius social infrastructure platform. The LoginRadius platform and Unified Social API features social login with 29 ID providers, single sign-on, user profile data, friend invite, social analytics, social sharing and more.
User authentication in apps is a pain, even if you've built an authentication system dozens of times. Forms, sessions, user tables, validation, password management, the list goes on in the seemingly never-ending to-do list for setting up a simple signup, login, and logout system for your app. OpenID company Janrain makes it easier, building on top of social networks.