Atlassian Crowd API

Atlassian is a software company that makes software development and collaboration tools. Crowd is a single sign-on (SSO) application. The Crowd API lets developers connect the service to their own applications. With the API developers can implement functionality such as implementation of applications that take advantage of SSO, user authentication, retrieving, adding, updating and removing users and more. The API uses RESTful calls and responses are formatted in XML and JSON.