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This plugin allow us to show some important notifications on the WordPress Dashboard page.
You can see a separate admin page once you activate this plugin. Here you can see a WYSIWYG editor to add the content (text, image etc).
Once you add your valid information, it will be displayed on the WordPress admin dashboard page.
This plugin is useful when we customize any plugins, we can list them out and keep inform the clients do not update them.
This plugins is very useful to show some kind of notification or information to whoever logged in as administrator.

Custom Dashboard Notifications

Here is a short description of the plugin. This plugin allow us to show some important notifications on the WordPress Dashboard page.

Phil Niehus

The Maintenance Countdown plugin adds a maintenance countdown page to your wordpress installation. This gives you the 
opportunity to tell your users what you are doing and how long they need to wait until your site is back online. 
Users with the ‘edit_themes’ capability are still able to access the site when maintenance is enabled.
Features:
<ul>
<li>Enable/disable maintenance mode</li>
<li>Page title, headline, maintenance information and check back message are customizable through the dashboard</li>
<li>The end date and time for the countdown can be set through the settings page on the dashboard</li>
<li>The countdown starts counting upwards if the end time is exceeded</li>
<li>Includes 2 different designs</li>
<li>Has an option to use custom css, for more information take a look at the faq</li>
</ul>

Maintenance Countdown

This plugin adds a maintenance countdown page to wordpress.

Custom Dashboard Notifications vs Maintenance Countdown