Single Sign -On
[Under Development]
Standards
SAML
OPEN ID
OPEN ID Connect
OAUTH 2.0
References
https://www.pingidentity.com/resource-center/
https://www.pingidentity.com/resource-center/SAML-Tutorials-and-Resources.cfm
http://hueniverse.com/2012/07/oauth-2-0-and-the-road-to-hell/