jackyfox

VKontakte Share Button plugin brings powerful way to add VKontakte share button for you posts and pages.
It supports all functions of VKontakte API and easy customizable:
<ul>
<li>You can choose one of seven button appearance types include custom</li>
<li>Place button on posts, pages and frontpage at will</li>
<li>Select location of button: before or after content, on the left or right</li>
<li>Exclude pages and posts by ID which should stay without buttons</li>
<li>Choose description of content: forepart of post/page or global description for all site</li>
<li>Can be used description from meta tag <code>description</code></li>
<li>Use your own site logo image specifying link or with meta tag <code>image-src</code></li>
</ul>
You can use the shortcode <code>[vk-share-button]</code>.
Also can be used PHP code in your template:
<pre><code><?php if (class_exists('VKShareButton'))
 if(!isset($VKShareButton)
 $VKShareButton = new VKShareButton();
 echo $VKShareButton->the_button() ?>
</code></pre>

VKontakte Share Button

Plugin allows you to add fully customizable share button of VKontakte social network.

emostarxd

bogdan_nazar

This plugin adds some social functionality to WordPress. Such as FB comments, VK comments, share buttons etc. 
The main capabilities of this plugin is listed below:
<ul>
<li>Internal share buttons (G+,FB,VK,Twitter,Delicious,Pinterest,LinkedIn and more) with ability to select preffered ones.</li>
<li>The tools for ordering internal social buttons.</li>
<li>The tools for “ShareThis” buttons embedding. Instructions are present to get customized ShareThis data.</li>
<li>Facebook and Vkontakte comment widgets.</li>
<li>Option to order them.</li>
<li>Option to switch on/off each of widgets including WP internal comments.</li>
<li>Default language is set to English.</li>
<li>Already translated for russian users.</li>
<li>And more other options to cusomize data and view of comment widgets.</li>
</ul>
This list of available features will grow in the future releases.
<h3>License</h3>
Plugin is free for any use. Don’t delete the authorship note if you’ll going to modify source code under the your needs.

Social Monster

This plugin adds some social functionality to Wordpress. Such as FB comments, VK comments, share buttons etc.

VKontakte Share Button vs Social Monster