DjZoNe

This plugins main goal was to provide the ability to any of your registered users, to invite more people to the community.
Please notice, that this plugin totaly ignores whether the registration is enabled or disabled to your blog.
<a href="https://downloads.wordpress.org/plugin/invite-friends.0.3.zip" rel="nofollow ugc">Download now!</a>
<a href="http://invite-friends.dev.rain.hu/" rel="nofollow ugc">Support</a> | 
<a href="http://invite-friends.dev.rain.hu/faq/" rel="nofollow ugc">FAQ</a> | 
<a href="http://djz.hu" rel="nofollow ugc">Author</a> 
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Some functions:
<ul>
<li>invitation sending</li>
<li>invitation cards limit per site</li>
<li>after activation, the user is logged in automatically</li>
<li>after activation, the user can be redirected to a custom URL</li>
<li>activation screen is using the same styles as the login screen (if you have customized login screen it will affect the activation screen as well)</li>
<li>Dashboard for custom settings Plugins > Invite friends settings</li>
<li>i18n support (localized messages)</li>
</ul>

Invite Friends

This plugin give the ability to anyone how registered to your blog, to invite more people, even if the registration is closed.

Patrick Daly

<a href="https://github.com/developdaly/Email" rel="nofollow ugc">Contribute on Github</a> | <a href="https://github.com/developdaly/Email/issues?labels=bug&milestone=&page=1&state=open" rel="nofollow ugc">Report Bugs</a>
This plugin allows you configure and reconfigure emails that are sent to specified users when certain things happen.
Some examples (applies to custom post types as well):
<ul>
<li>new post</li>
<li>updated post</li>
<li>deleted post</li>
<li>(more coming soon)</li>
</ul>
Additionally, you control the email template users receive. Boilterplate templates are included to get you started.

Email

Email users with custom templates when certain actions happen, such as new posts or updated custom post types and keep a log of sent emails.

Invite Friends vs Email