Pat Hawks

<p>When Gravatar has no image on file for a user, this plugin takes over and searches for a Facebook, Twitter, or Gmail profile picture to use in it’s place.</p>


Better Avatars

Replace empty Gravatars with profile images from Facebook, Twitter, or Gmail

victor_jonsson

<p>Once you have installed this plugin you can login to wp-admin using your ordinary user name (or your email)<br />
and your password on GMail (your old wordpress password still works as well).</p>
<h4>Additional features</h4>
<ul>
<li>You’ll get a log of all login activity in wp-admin</li>
<li>Add an HTML-snippet that will be added below the login form</li>
</ul>


Simple Gmail Login

With this plugin you can login to wp-admin using your GMail credentials

Better Avatars vs Simple Gmail Login