Tammy Hart

<p>This plugin adds a page to the admin under Users that includes a form for users to send email invitations to their friends to register at your site. You can also add the form to the front end of your site with the <code>invite_friends()</code> template tag or the <code>[invite_friends]</code> shortcode.</p>
<p><strong>IMPORTANT:</strong> This plugin will not allow invited friends to register unless you have registration turned on.</p>
<h4>Features</h4>
<ul>
<li>Invite multiple friends at one time</li>
<li>Customize the email subject and message that is sent</li>
<li>Customize the URL to redirect a user to after they register</li>
<li>Store successful registered users in the inviter’s user meta data</li>
<li>Store the inviter in the new user’s meta data</li>
</ul>


Invite Friends to Register

Use this plugin to allow users to invite their friends to register on your site.

Tyrel Kelsey

<p>Automatically invite users that have filled out a specified form to your Slack team instead of having to manually invite them yourself.</p>


Formidable to Slack

Allows site owners to automatically send Slack invites to anyone that fills out a specified form.

Invite Friends to Register vs Formidable to Slack