Neil Simon

Enter an email address and available contact information is displayed:
<ul>
<li>Photo</li>
<li>Name</li>
<li>Demographic information</li>
<li>Personal interests</li>
<li>Clickable social links (LinkedIn, Twitter, Facebook, …)</li>
<li>Recent <a href="http://twitter.com/" rel="nofollow ugc">Twitter</a> updates</li>
<li>Recent <a href="http://plancast.com/" rel="nofollow ugc">Plancast</a> plans</li>
<li>Optionally, emails the displayed contact information to any valid email address</li>
</ul>
Contact information provided by <a href="http://fullcontact.com" rel="nofollow ugc">FullContact</a>.
Email services provided by <a href="http://sendgrid.com/" rel="nofollow ugc">SendGrid</a>.

RainmakerMoxie

RainmakerMoxie (BETA-limited support) is an interactive sidebar widget. Enter an email address and it displays a photo, name, social links and more.

FuseForms

FuseForms MailChimp Integration for WordPress is the easiest way to sync your contacts from your forms to a MailChimp list of your choosing.
<h4>How it Works</h4>
FuseForms automatically hooks into your existing forms on your site and syncs them to a MailChimp list of your choosing.
FuseForms works with:
<ul>
<li>Most custom forms</li>
<li>Contact Form 7</li>
<li>Gravity Forms</li>
<li>Formidable</li>
<li>Ninja Forms</li>
<li>JetPack</li>
<li>Fast Secure Contact Form</li>
<li>Contact Form</li>
<li>Contact Form Clean and Simple</li>
<li>Quform</li>
<li>Native WordPress comment forms</li>
</ul>
FuseForms doesn’t work with:
<ul>
<li>Forms contained in an iFrame</li>
<li>Wufoo</li>
<li>WooCommerce</li>
<li>FormCraft</li>
<li>Easy Contact Forms</li>
<li>JotForm</li>
<li>Ninja Popups</li>
<li>SumoMe</li>
<li>Jetpack comments</li>
<li>Disqus comments</li>
</ul>

MailChimp Integration for WordPress

FuseForms MailChimp Integration for WordPress is the easiest way to sync your contacts from your forms to a MailChimp list of your choosing.

RainmakerMoxie vs MailChimp Integration for WordPress