wpeffects

RS Coming Soon plugin has super admin panel where your customize anything including fonts and translate to any language and control saved emails from visitor and export to csv formate even you can remove emails from admin panel. Its fully SEO optimized under construction plugin
See live demo here: http://themebon.com/rs-coming-soon/
Features
<ul>
<li>Super easy installation.</li>
<li>Works with any theme.</li>
<li>Fully Responsive.</li>
<li>Fully Customizable.</li>
<li>Amazing cloud effects.</li>
<li>Seo friendly.</li>
<li>Powerful security.</li>
<li>Form validation.</li>
<li>Show success message after submit.</li>
<li>Store emails in database.</li>
<li>Show emails in dashboard.</li>
<li>Remove emails from dashboard.</li>
<li>All major browser supported.</li>
<li>and many more.</li>
</ul>

RS Coming Soon

RS Coming Soon plugin Creates a page for your Website while it's under construction and collects emails from your visitors and show in dashboard.

irefer

<h4>Grow Your Email List</h4>
You don’t need to be a technical whiz to set up Viral Sign Ups. Download and install our WordPress plugin and use the wizard to fill in the blanks. It’s that easy.
When someone signs up on your website, they will be prompted to get say 5 friends to sign up as well in exchange for something cool, like immediate access to your service or a free product.
Each person gets a unique url to promote your site. Every time someone signs up through their link, we’ll send them an email notification telling them how many more people they need to refer in order to claim your offer!
You as the campaign owner will be able to see how many people have signed up and the number of friends each one referred. You will also be able to export all of their emails.
Where your data is stored. 
Your data is stored on our server and your auto reply emails when a new user signs up or refers a friend are sent out from our server. This way we can insure everything works smoothly and you don’t run into any difficulties with emails not being sent out.
The plugin comes with the following features.
<ul>
<li>
Form Creator – choose your button text and colour
</li>
<li>
Create your custom offer to your customers for their referrals
</li>
<li>
Easily place the form anywhere on your page with a short-code
</li>
<li>
Collect up to 10,000 emails per month
</li>
<li>
With each referral your user will get an auto-response email of their progress
</li>
<li>
Export your list of sign up emails as a cvs file
</li>
<li>
Mobile Friendly
</li>
<li>
See who referred who. Emails are tagged to the person that referred them.
</li>
<li>
See the referring site url that your sign up came from
</li>
<li>
Updates & Support
</li>
</ul>
Further details can be found here: http://www.viralsignups.com

Viral Sign Ups

Grow your email lists by encouraging your leads to share your offer and reward them for every referral they generate on your behalf.

RS Coming Soon vs Viral Sign Ups