alexisabarca

With this very simple plugin you can use the blog URL to authenticate with OpenID using an another OpenID provider. 
called Delegation.
In order to maximize performance the vars are contained in plugin file rather than storing in a database.
Due to security issue (https://wordpress.org/news/2011/06/passwords-reset/) php file is gpg signed, ID 7ED1BC0C.

Open ID Delegate

This plugin adds the necessary tags to be able to use your blog URL as OpenID address using another OpenID provider

miniOrange

Nimesh

oauth

WP OAuth Server ( Login with WordPress )

Single Sign-On using WordPress - Login with WordPress to your application/sites using your WordPress account. [24/7 Support]

Open ID Delegate vs WP OAuth Server ( Login with WordPress )