Matthias Pfefferle

Will Norris

OpenID is an <a href="http://openid.net/" rel="nofollow ugc">open standard</a> that allows users to authenticate to websites without having to create a new password. This plugin allows users to login to their local WordPress account using an OpenID, as well as enabling commenters to leave authenticated comments with OpenID. The plugin also includes an OpenID provider, enabling users to login to OpenID-enabled sites using their own personal WordPress account. <a href="https://wordpress.org/plugins/xrds-simple/" rel="ugc">XRDS-Simple</a> is required for the OpenID Provider and some features of the OpenID Consumer.
Developer documentation, which includes all of the public methods and hooks for integrating with and extending the plugin, can be found <a href="http://wiki.diso-project.org/wordpress-openid-api" rel="nofollow ugc">here</a>.

OpenID

Allows WordPress to provide and consumer OpenIDs for authentication of users and comments.

smartfin

This plugin enables your users to sign-in with their Google/Yahoo/Facebook and 
other social identities. Our key design point is simplicity, you can get your 
site up in literally under 60 seconds, and there is no 3rd party sites to 
visit or configure.
Our service is completely free for low traffic sites. If your site grows in 
the future, we also offer advanced features for a moderate price, 
such as the following:
<ul>
<li>Extended profile attribute capturing</li>
<li>Pre-built integration, with email marketing, and content management systems</li>
<li>Programmable integration, with various language support</li>
<li>Full identity management suite, with user, role, and permissions management</li>
</ul>
We believe our implementation, focusing on simplicity, is superior to others 
in the same space. But we are still new and would appreciate your 
feedback. Please feel free to comment/rate us here on WordPress, or 
write us for whatever issues you encounter at help@sumilux.com

Social Sign-In

This plugin enables your users to sign-in with their Google/Yahoo/Facebook and other social identities. Our key design point is simplicity, you can ge …

OpenID vs Social Sign-In