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.

Florent Maillefaud

The WP Maintenance plugin allows you to put your website on the waiting time for you to do maintenance or launch your website. Personalize this page, pictures and countdown with:
<h3>Features</h3>
<ul>
<li>Choice texts colors and fonts</li>
<li>Upload logo picture</li>
<li>Upload background picture or pattern</li>
<li>Countdown</li>
<li>Custom Code Header for Analytics ready</li>
<li>Social Networks ready</li>
<li>Customize CSS</li>
<li>Insert for shorcode (Newletter or Contact form)</li>
<li>Enable “503 Service temporarily unavailable”</li>
<li>Choose access by Roles and Capabilities</li>
<li>Choose access by ID Pages</li>
<li>Choose access by IP addresses</li>
</ul>
wp-maintenance.pot file available

WP Maintenance

Create and customize your maintenance page

RS Coming Soon vs WP Maintenance