Mark Bridgeman

Rokku Maintenance Mode lets administrators easily enable a maintenance mode for their WordPress site. 
When enabled, non-logged-in visitors will see a custom maintenance page with:
<ul>
<li>A custom logo</li>
<li>A headline message</li>
<li>A WYSIWYG text message</li>
</ul>
The WordPress admin bar turns red while maintenance mode is active, and an admin notice is displayed.
Perfect for site updates or temporary downtime, without the complexity.
<h3>License</h3>
This plugin is licensed under the GPLv2 or later.

Rokku Maintenance Mode

A simple maintenance mode plugin for WordPress. Customize your maintenance page with a logo, headline, and WYSIWYG message.

Robust Decoders

Pradeep Shekhawat

Dynamic Maintenance Mode allows administrators to activate maintenance mode for all users or only non-logged-in visitors. You can also set a custom redirect page and schedule automatic start/end times.
Key Features: 
– Enable maintenance mode for all visitors or just guests 
– Set a custom page to display during maintenance 
– Schedule start and end time for automatic mode activation 
– Easy-to-use settings panel under the WordPress admin

Dynamic Maintenance Mode

Fantastic

Enable a flexible maintenance mode with scheduling, custom page redirection, and user scope options.

Rokku Maintenance Mode vs Dynamic Maintenance Mode