[Web Authentication] Opauth - Multi-provider authentication framework for PHP

An "intermediate layer" to allow a PHP application to connect to different web providers

http://opauth.org/



http://bakery.cakephp.org/articles/uzyn/2012/06/25/simple_3rd-party_provider_authentication_with_opauth_plugin#how-to-use-this-plugin


https://developers.google.com/accounts/docs/OAuth2WebServer