Pippin Williamson

Easily put your site into maintenance mode with this plugin so that you can perform updates. The plugin works by taking a selection of IP addresses and comparing them to the visitor’s IP address.
Users whose IP addresses match those specified in the settings page can view the site normally. Users who do not have IP access are directed either you a WordPress page (which you pick), or to any external url.
It’s extremely simple to use:
<ul>
<li>activate the plugin</li>
<li>go to the “Maintenance Mode” settings</li>
<li>check the “Enable Box”</li>
<li>enter the IP addresses that should have access</li>
<li>choose whether to redirect non-authorized users to a page or url</li>
<li>choose the page or enter the url</li>
</ul>
Once your site is ready to be made available again, simple uncheck the “Enable” box.

CGC Maintenance Mode

Good options, no check if the URL is on the same domain which causes redirect loop.



Almost there

This plugin allows you to put your site into maintenance mode, by allowing only users with specified IP addresses to view the site.

WP Chill

Awaken Solutions Inc.

This plugin allows you to easily mark certain pages with “Permissions” and only users with those permissions will be allowed to see the contents of the page.
<ul>
<li>
Page Permissions: This plugin adds a new Permissions taxonomy to your pages. Administrators can create/assign new permissions from the Edit Page screen (you can also use the Quick Edit link). You can add/edit/delete permissions from the Permissions sub-menu under the Pages menu. Pages with no assigned permissions can be seen by everyone.
</li>
<li>
User Permissions: Administrators can add/remove permissions from a user using the checkboxes on the Edit User screen. The All Users page has a column that shows the permissions assigned to each user.
</li>
<li>
Restriction Message: If a page has permissions assigned, the content will only be visible to users that have one of those same permissions assigned. Otherwise, the content will be replaced by a generic message or a custom message which can be defined in the plugin settings using the standard WordPress editor (including the ability to add media and formatting).
</li>
<li>
Redirect to login: Instead of a restriction message, you can choose to have users get redirected to the login page.
</li>
</ul>

Simple Restrict

Restrict pages based on permissions assigned to pages and granted in user profiles.

CGC Maintenance Mode vs Simple Restrict