Manuel Razzari

Users who are not logged-in will be <code>302</code> redirected to an absolute URL specified by the admin.
Any user who can log in, from admins to subscribers, will be able to access the site.
To turn off this redirection, clear the redirect URL field, or simply disable this plugin.
<h4>Use cases</h4>
This is a very minimal plugin for very simple use cases, when you want to avoid the bloat of a full-on redirection plugin.
<ul>
<li>Site launch. Redirect to some static coming soon page. Then disable the plugin to launch the site!</li>
<li>Staff-only site. Only members of your staff can log in.</li>
<li>Membership. If your needs are very simple, this plugin might work.</li>
</ul>

Redirect anonymous users

Users who are not logged-in are redirected to a specific URL.

Florent Maillefaud

The WP Maintenance plugin allows you to put your website on the waiting time for you to do maintenance or launch your website. Personalize this page, pictures and countdown with:
<h3>Features</h3>
<ul>
<li>Choice texts colors and fonts</li>
<li>Upload logo picture</li>
<li>Upload background picture or pattern</li>
<li>Countdown</li>
<li>Custom Code Header for Analytics ready</li>
<li>Social Networks ready</li>
<li>Customize CSS</li>
<li>Insert for shorcode (Newletter or Contact form)</li>
<li>Enable “503 Service temporarily unavailable”</li>
<li>Choose access by Roles and Capabilities</li>
<li>Choose access by ID Pages</li>
<li>Choose access by IP addresses</li>
</ul>
wp-maintenance.pot file available

WP Maintenance

Create and customize your maintenance page

Redirect anonymous users vs WP Maintenance