Single Sign-On for WordPress 3.0+
Single Sign-On (SSO) allows you to immediately sign in users as they browse between multiple and independent websites in your ecosystem. Take away the need for yours users to re-enter their authentication credentials when they switch from one of your WordPress blogs to another.
Official WordPress plugin
Single Sign-On is maintained by OneAll. OneAll, a technology company offering a set of web-delivered tools and services for establishing and optimizing a site's connection with social networks.
The GNU General Public License (GPL) is available at http://www.gnu.org/licenses/old-licenses/gpl-2.0.html.
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