SDM36

A Coming Soon plugin which gives you extensive control over what is displayed. 
Includes FontAwesome social media icons and code editor for custom css.
Logged in visitors have access to the site as usual whilst visitors to the site who are not logged in will see the coming soon page.
Display the site title and header image, a featured image, title and content from a selected page or a combination of the two.
Page content accepts shortcodes allowing users to fully customise their coming soon page.
Fullscreen background images should be 1920px x 1080px and web optimised to reduce loading times.
Includes countdown timer option, leave blank to omit.
All Options:
<ol>
<li>Coming Soon Page Active</li>
<li>Choose the content page</li>
<li>Enable Social Icons</li>
<li>Pick a Background colour</li>
<li>Pick a Text colour</li>
<li>Pick a Box colour</li>
<li>Box Opacity:</li>
<li>Border Shadow for Box</li>
<li>Countdown Timer Date</li>
<li>Choose the logo</li>
<li>Choose the title</li>
<li>Choose the content</li>
<li>Choose the background</li>
<li>Text alignment</li>
<li>Custom CSS styles</li>
</ol>
<h3>Notes:</h3>
The plugin will only display the site title and or logo until a content page is chosen.

NNM Coming Soon Page

A Coming Soon plugin which gives you extensive control over what is displayed.

neojp

ZÆN

SplashGate is a splash page plugin. It does optional full page redirection that won’t mess up search engine indices, and makes permanently available a url that will always redirect to the actively splashed page. Alternatively, splash page content can be made to appear as an overlay (using fancybox) instead of redirecting.
Splash management is centralized, so it’s easy to see if a splash page is active, which page is the active splash, and to easily disable or enable new pages. There is also a dashboard widget, recurrence timing options, and overlay sizing configuration.

SplashGate

Caching and SEO friendly way to allow any page to be used as a splash page or splash overlay.

NNM Coming Soon Page vs SplashGate