Miriam de Paula

WP Coming Soon is a plugin that adds a countdown clock in the Coming Soon page. This plugin uses Keith Wood jQuery plugin. See it at: http://keith-wood.name/countdown.html.
[BASIC USAGE]
Put this <code>if ( function_exists('get_countdown')) get_countdown();</code> where you want to display the countdown clock…
If you want to use the countdown timer within a page or page template, you can use the shortcode <code>[wp_coming_soon]</code>

WP Coming Soon

WP Coming Soon is a simple plugin that adds a countdown clock in your Coming Soon page... Nothing more!

Acewebx

IMS Countdown Timer enhances your website by allowing you to effortlessly showcase a visually appealing countdown on your post or page. This engaging feature not only captivates your audience but also contributes to retaining users on your site. Elevate the user experience and create a sense of anticipation with the IMS Countdown Timer, making your content more dynamic and interactive. 
 * Check out the
<h3>⚡️ FEATURES</h3>
<blockquote>
<ul>
<li>Easy implementation with shortcodes</li>
<li>Set customized text for date and time</li>
<li>Personalize box colors</li>
<li>Customize text and background colors</li>
<li>Stylish countdown with Google Fonts</li>
<li>HTML5 compatibility: No flash, only jQuery</li>
<li>Create an unlimited number of styles</li>
<li>Redirect to URL option after expiry</li>
<li>Hide option after expiry</li>
<li>Show link after expiry</li>
<li>Timezone customization</li>
<li>Fully responsive design </li>
<li>Ability to use Multiple countdown Timers on the same Post/Page</li>
</ul>
</blockquote>

IMS Countdown

IMS Countdown timer allows you to display a countdown on your post or page.

WP Coming Soon vs IMS Countdown