Mahabubur Rahman

The Google+ Plugins is a wordpress widget plugin. It lets you easily embed and promote any Google Plus Page or User profile follow button on your website. Just like on Google Plus, your visitors can follow the Page or user without leaving your site.
<h4>Features</h4>
<ul>
<li>Show or hide follow count bubble.</li>
<li>Show horizontal or vertical bubble.</li>
<li>Bubble size change. You can set bubble as small, medium or large.</li>
<li>Widget title change.</li>
<li>You can set page or profile follow button by writing its valid url.</li>
</ul>

SM Google+ Plugins

The Google+ Plugins is a wordpress widget plugin. It lets you easily embed and promote any Google Plus Page or User profile follow button on your webs …

Mervin Praison

This plugin helps you add Google authorship markup to your WordPress site, allowing your Google Plus profile picture to appear in Google Search results.
Features: 
* Easy 4-step setup process 
* Multiple author support 
* Multisite compatible 
* Shortcode support

WP Google Authorship

Nice

Google Plus Profile Picture appear in Google Search. Very Easy to implement. Including Google authorship for multiple authors and multisite.

SM Google+ Plugins vs WP Google Authorship