Vitalii Kiiko

(Eng) Adds a “Maintenance Mode” page to your site (sending a “503 Service Unavailable” status). Includes MailChimp mail subscriptions.
(Ukr) Плагін додає сторінку-заглушку типу “На реконструкції” (надсилається статус “503 Сервіс недоступний”). Включає форму підписки на ел. пошту з допомогою MailChimp.
<a href="http://demo.uni-theme.net/" rel="nofollow ugc">Live demo!</a>
Features:
<ul>
<li>Used custom fonts with cyrillyc characters</li>
<li>Social service integration</li>
<li>MailChimp e-mail subscription form</li>
<li>2 themes available</li>
<li>Custom logo</li>
</ul>

Uni-theme Maintenance Mode

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.

Uni-theme Maintenance Mode vs RS Coming Soon