matsuoshi

Maintenance Mode for Non-administrator login users. 
This plugin block access to Admin-page by Editor, Writer etc. 
Only Administrator can access the Admin-page while this plugin is active.
Meanwhile, this plugin doesn’t block visitors’ access to the site.

Admin Hot Maintenance Mode

Maintenance Mode for Non-administrator login users. Only Administrator can access the Admin-page.

WPExperts.io

Maintenance mode or a coming soon page with progress bar and responsive layout. Simply enable the maintenance mode from the plugin settings and in few seconds you can put your site in maintenance mode.
With a progress bar and countdown timer visitors will be informed about the time left till launch and you can collect their emails using built-in MailChimp integration.
Features
<ul>
<li>Simple & easy to use interface – perfect for non tech users</li>
<li>Create beautiful maintenance mode or coming soon page for your WP site</li>
<li>Change heading & sub-heading</li>
<li>Set custom title for maintenance mode or coming coon page</li>
<li>SEO Optimized</li>
<li>Enable / Disable maintenance or coming soon mode</li>
<li>Progress Bar</li>
<li>Countdown Timer</li>
<li>Visual editor for changing content</li>
<li>Social Icons</li>
<li>Upload your own logo</li>
<li>Change background color and various text colors</li>
<li>Choose from hundreds of fonts</li>
<li>Set SEO Title of maintenance mode page</li>
<li>Set Favicon</li>
</ul>

Rocket Maintenance Mode & Coming Soon Page

Easy to use and almost fully customizable



Does what it says - creates a maintenance page, but everything is pretty much locked down unless you upgrade to the premium version, which the plugin authors annoyingly let you know everywhere. Makes you think that they're just trying to make a buck. Can't even change the font color.
There are better plugins that do exactly this that are much more configurable. I'd keep looking.



Much better, more configurable plugins out there to do this

Create great looking Maintenance Mode Page or Coming Soon Page that sets up in minutes.

Admin Hot Maintenance Mode vs Rocket Maintenance Mode & Coming Soon Page