shazdeh

This plugin enables you to quickly add beautiful modals by adding widgets to the Popup area. You can choose to trigger the popup automatically on page load, or manually, which the plugin generates the required code for you.
Since 0.4, the plugin can be extended to support any popup script library (beta stage). Now the plugin supports <a href="http://www.rockettheme.com/wordpress-downloads/plugins/free/2625-rokbox" rel="nofollow ugc">RokBox plugin</a> as well. To enable it, you must add this bit to your wp-config.php file: 
 define( ‘POPPOP_SCRIPT’, ‘RokBox_PopPop_Script’ );
You can use <a href="https://wordpress.org/extend/plugins/widget-logic/" rel="ugc">Widget Logic</a> plugin to completely take control of in which parts of your website the popups are displayed.

PopPop

Easily display your widgets inside modal and popup windows.

mahethekiller

Content Reveal Countdown is the ultimate WordPress plugin for scheduling content visibility. Create beautiful countdown timers that automatically hide your content until specific dates and times, then reveal it automatically when the countdown ends.
<h4>Boost Engagement & Build Anticipation</h4>
<ul>
<li>Scheduled Content Release: Set exact dates and times for content to become visible</li>
<li>Beautiful Timer Designs: Choose from 4 professionally designed countdown styles</li>
<li>Increase User Engagement: Build anticipation and keep visitors coming back</li>
<li>Flexible Display Options: Show timers on specific pages or site-wide</li>
<li>Admin-Friendly: Disable timers for admin users for easy testing</li>
</ul>
<h4>Perfect For</h4>
<ul>
<li>Product Launches: Build hype before big releases</li>
<li>Course Content: Time-based lesson releases</li>
<li>Event Countdowns: Create excitement for upcoming events</li>
<li>Special Announcements: Schedule important updates</li>
<li>Membership Sites: Time-gated content for subscribers</li>
<li>Limited Time Offers: Create urgency for promotions</li>
</ul>
<h4>Key Features</h4>
<ul>
<li>Date-Based Scheduling: Set exact end dates for content visibility</li>
<li>4 Beautiful Designs: Modern, Classic, Minimal, and Elegant timer styles</li>
<li>Page-Specific Control: Show timers on selected pages only</li>
<li>Admin Disable Option: Test without seeing timers as admin</li>
<li>Mobile Responsive: Works perfectly on all devices</li>
<li>SEO Friendly: Doesn’t affect your search engine rankings</li>
<li>Lightweight: Fast loading with minimal performance impact</li>
</ul>
<h3>License</h3>
This plugin is licensed under the GPL v2 or later.

Content Reveal Countdown

Schedule content visibility with beautiful countdown timers. Hide content until specific dates to build anticipation and increase engagement.

PopPop vs Content Reveal Countdown