zanzofily

A powerful Plugin to protect your WordPress registration page. 
Why? 
A lot of WordPress users use extra fields Plugins and msot of them want to hide registration fields for non-invited users, using this simple plugin only users with invitation will be able to see registration page.
<h4>Features</h4>
<ul>
<li>Easy to install and use.</li>
<li>Works with your theme’s files and UI style.</li>
<li>A complete help guide for your support.</li>
<li>Protect your registration page using a single password.</li>
<li>if you are already using (Easy Invitation Codes) Plugin you can use it as invitation codes source.</li>
<li>Prevent already logged in users from visiting registration page.</li>
</ul>

Protected Registration

A powerful Plugin to protect your Wordpress registration page.

manishbhojwani3

WP Social Invites allow your visitors to invite their social network friends directly into your WordPress site. This plugin has no conflict with any Plugin.
Demo link: 
http://webtanner.com/projects/demos/wp-social-invites/
Key Feature:
<ul>
<li>Send invitation personally in form of personalized text.</li>
<li>Page and Popup supportive.</li>
<li>Supports widgets.</li>
<li>Supports shortcode.</li>
<li>Default slider layout.</li>
<li>Responsive popups.</li>
</ul>

WP Social Invites

WP Social Invites allows your visitors to invite their social friends on your website.

Protected Registration vs WP Social Invites