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.

saill

Lets you set a date to launch or suspend your site automatically. Lets you choose which admins have access to the plugin settings. Generates beautiful Coming Soon and Site Suspended pages with customizable background image or color and and an optional message box that can also allow users to log in from the coming soon page. Alternatively allows you to redirect to a different URL. This plugin is based on the <a href="https://wordpress.org/plugins/underconstruction/" rel="ugc">underConstruction</a> plugin. A complete description along with screenshots and usage instructions is <a href="http://www.wickedcleverlabs.com/site-launcher/" rel="nofollow ugc">here</a>.

Site Launcher

Timed launch or suspension of your site with custom "site unavailable" pages or with a redirect.

Redirect anonymous users vs Site Launcher