dpchiesa

gplus is a WordPress Plugin.
It provides a WordPress Widget that displays a list of your recent 
Google+ activities in the sidebar. The plugin uses the Google+ API, and 
authenticates via an API key that YOU (the installer) acquire via the 
Google API Console.
Because it uses the public REST API of Google+ that Google documents and 
supports, this plugin is very reliable and simple. (Other WordPress 
widgets that say they show Google+ activity have relied on 
screen-scraping, which makes them brittle and unreliable.)
<h3>Dependencies</h3>
This plugin depends on and uses the published google-api-php-client, 
available at http://code.google.com/p/google-api-php-client/ .
Rather than requires the installer to download this code, it is packaged 
within the plugin. The Google API php client library is licensed 
independently from the gplus WordPress plugin; The former is licensed 
under the Apache 2.0 license.
<h3>Thanks</h3>
Thanks for your interest!
You can make a donation at http://cheeso.members.winisp.net/GplusWidgetDonate.aspx
Check out all my plugins: 
https://wordpress.org/extend/plugins/search.php?q=dpchiesa
-Dino Chiesa

GPlus

mabujo

googleCards is a google+ wordpress plugin. 
It adds a widget to your blog that will display a link to your google+ profile so people can add you to a circle (follow you). It also displays your name, profile picture and the number of people who have you in circles.
The plugin uses caching to store your google plus profile data to eliminate checking google+ on every page load. 
For the caching to work, your web-server needs to be able to write to wp-content. (a lot of plugins require this so it should be fine). 
If the plugin cannot cache it will still work, but will store the data in the database instead. If caching is working you should see a file called plus_card.txt in /wp-content/cache/. 
As of version 0.4, caching will also failback to using transients to store your scraped google plus data.
Plugin page : <a href="http://plusdevs.com/google-wordpress-plugin/" rel="nofollow ugc">Google plus wordpress plugin @ plusdevs</a>

googleCards

A simple plugin that adds a google+ widget for linking to your google+ profile and showing your number of followers

GPlus vs googleCards