CantonBolo

Features: 
1. In addition to the jQuery library, only need to load some little JS files and some little of CSS files. 
2. The output code of the plug-in on the page in line with W3C’s XHTML 1.1 and CSS 3 standards, and the code structure is very simple. 
3. When deactivated，the images calling code generated by the plug-in will not cause any adverse effects.
This plugin allows you easily to make <a href="http://flowplayer.org/tools/demos/overlay/gallery.html" rel="nofollow ugc">Overlay gallery</a> popups on WordPress.
这个插件助你在 WordPress 中轻易地使用 <a href="http://flowplayer.org/tools/demos/overlay/gallery.html" rel="nofollow ugc">Overlay gallery</a> 相册功能。
<h4>Supported Languages:</h4>
<ul>
<li>US English/en_US (default)</li>
<li>简体中文/zh_CN (translate by <a href="http://imbolo.com/" rel="nofollow ugc">bolo</a>)</li>
</ul>

Overlay4WP

Easy to use Overlay popus gallery in WordPress.Base on jQuery Library.

pupungbp

Easy Popup Announcement helps you to display popup / pop-over / popup overlay on your WordPress website. It’s easy to use and straight-forward. Popup content is manageable within content editor, which you can add text, images, or even form like newsletter.
Features:
<ul>
<li>Plugin Options</li>
<li>Responsive Layout Supported – Nicely viewable on mobile devices</li>
<li>Cookies – Manage when your popup should be re-appear</li>
<li>Changeable overlay background color</li>
<li>More to come…</li>
</ul>
Support the Author: <a href="https://pupungbp.com" rel="nofollow ugc">The Developer Will Keep This Plugin Free</a>

Easy Popup Announcement

Easy Popup Announcement helps you to display popup / pop-over / popup overlay on your WordPress website.

Overlay4WP vs Easy Popup Announcement