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

Garrett Grimm

<a href="https://appsumo.com/search?tags=wordpress&utm_source=sumo&utm_medium=wp-widget&utm_campaign=social-media-widget" rel="nofollow ugc">Check out the latest WordPress deals for your site.</a>
Creates a ‘Coming Soon’ page that will show for all users who are not logged in. Useful for developing a site on a live server, without the world being able to see it

underConstruction

Came across this plugin because I forgot to put a space in between 'under' and 'construction' never looked back, so easy, so simple just gets the job done!

Just does it!

Creates a 'Coming Soon' page that will show for all users who are not logged in

Uni-theme Maintenance Mode vs underConstruction