An authentication framework that handles authorization with external web services.
See the Keyring Developer's Guide for more details.
Keyring provides a very hookable, completely customizable framework for connecting your WordPress to an external service. It takes care of all the heavy lifting when making authenticated requests, so all you need to do is implement cool features and not worry about these tricky bits.
Out of the box, Keyring currently comes with base Service definitions for webservices which use:
And includes an example service implementation (services/extended/example.php) plus ready-to-use definitions for:
You can very easily write your own Service definitions and then use all the power of Keyring to hook into that authentication flow. See the Keyring Developer's Guide for more details.