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.

Alexey Tomorovich

This plugin help you to change theme for mobile, specific pages, posts, categories. 
It can be useful for creating mobile application, landing page, A/B testing and others pages which need to use another design.
How it works:
There are six levels for switching themes:
<ol>
<li>
Mobile. You can add a new theme for mobiles applications. 
This level cannot be overridden by next levels.
</li>
<li>
Posts. You can add a new theme for each posts that you want. 
This levell can be overridden by mobile level.
</li>
<li>
Pages. You can add a new theme for any page. 
This levell can be overridden by mobile level.
</li>
<li>
Categories. You can add a new theme for any category. Also you have opportunity to extend a new theme for all posts of this category. 
This level can be overridden by mobile, posts level.
</li>
<li>
Regular expression. If you know how write regular expression, you can make rule for a new theme. Plugin will be check url with your regular expression. 
This level can be overridden by mobile, posts, pages, categories level.
</li>
<li>
Main theme. This means that new theme will extends for all pages of your website. 
This level can be overridden by each previous level.
</li>
</ol>
For working with plugin you have next interface. 
Dropdowns which contain posts/categories/pages. 
Near them you see dropdowns with themes and button “plus”. 
When you select any post/category/page and theme in them, you should click on plus. 
That mean new theme will tied with choosing post/category/page and display on public site when user open this post/category/page. 
You can add many rules. There are no limit to the number.

A.T. Many themes

This plugin help you to change theme for mobile, specific pages, posts, categories. It can be useful for creating mobile application, landing page, A/ …

NNM Coming Soon Page vs A.T. Many themes