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

Antonio Campos

This plugins had the needed code to the header of your blog, to detect your OpenID account at http://openid.sapo.pt. Configure your person name at the administration panel. Look at my blog source code and check the header (http://antoniocampos.no-ip.com).

Sapo OpenID Header

This plugins had the needed code to the header of your blog, to detect your OpenID account at http://openid.sapo.pt.

Open ID Delegate vs Sapo OpenID Header