Azure Active Directory offers developers an effective way to integrate identity management in their applications. Industry standard protocols such as SAML 2.0, WS-Federation, and OpenID Connect makes sign-in possible on a variety of platforms such as .Net, Java, Node.js, and PHP. The REST-based Graph API enables developers to read and write to the directory from any platform. Through support for OAuth 2.0, developers can build mobile and web applications that integrate with Microsoft and third party web APIs, and build their own secure web APIs. Open source client libraries are available for .Net, Windows Store, iOS and Android with additional libraries under development.