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.

saill

Lets you set a date to launch or suspend your site automatically. Lets you choose which admins have access to the plugin settings. Generates beautiful Coming Soon and Site Suspended pages with customizable background image or color and and an optional message box that can also allow users to log in from the coming soon page. Alternatively allows you to redirect to a different URL. This plugin is based on the <a href="https://wordpress.org/plugins/underconstruction/" rel="ugc">underConstruction</a> plugin. A complete description along with screenshots and usage instructions is <a href="http://www.wickedcleverlabs.com/site-launcher/" rel="nofollow ugc">here</a>.

Site Launcher

Timed launch or suspension of your site with custom "site unavailable" pages or with a redirect.

RS Coming Soon vs Site Launcher