Max Chirkov

This plugin adds a button to the text editor’s toolbar and allows to display your content in a thickbox effect. The plugin can include any inline content, iFramed or Ajax content located on other pages.
Check out a quick <a href="http://www.phoenixhomes.com/files/plugins/thkboxcontent/video_demo.swf" title="Demontration Video" rel="nofollow ugc">Demo Video</a>
<h3>Notes</h3>
Note: Images will open up in a Thickbox when you insert them via media library as a thumbnail with a link to the original size. Simply add class=”thickbox” to the <a> element around the image.</a>

ThickBox Content

ThickBox Content provides a quick and easy way to insert any type of content into a thickbox (via page/post editor). It supports thickbox iFrame, Ajax …

Inisev

popups

Try it out on your free dummy site: Click here => <a href="https://demo.tastewp.com/mpu" rel="nofollow ugc">https://tastewp.com/plugins/pop-up-pop-up</a>. 
(this trick works for all plugins in the WP repo – just replace “wordpress” with “tastewp” in the URL)
Create stunning pop-ups in a breeze!
This plugin allows you (in combination with MyPopUps.com) to place cool-looking pop-ups on your site for various purposes:
<ul>
<li>Collect emails</li>
<li>Show discount codes</li>
<li>Get social likes & shares</li>
<li>Show cookie notices</li>
<li>Block ad-blockers</li>
</ul>
You can design the pop-ups to your liking thanks to the powerful builder on MyPopUps.
You can activate & disable the pop-ups directly inside this plugin (without having to leave your WP dashboard)!
Coming soon: define much more granular rules when & how the pop-ups should show (using WordPress parameters, inside this plugin).
Give it a shot! If you find any ways how to improve it, please let us know in the support forum, we’ll always try to respond quickly 🙂
Note: This plugin relies on the 3rd party service MyPopUps, which can be reached at https://mypopups.com. The pop-ups are created on MyPopUps and displayed on your website with the help of this plugin. Only when you click on the “Yes” button in the plugin a connection is established to MyPopUps (this is also mentioned on that button). For the confidential handling of your data, please have a look at MyPopUps’ GDPR-compliant privacy policy at https://mypopups.com/privacy as well at the terms of use at https://mypopups.com/terms. If you have any questions about those, please don’t hesitate to contact us here https://mypopups.com/contact-us. Thank you!

Pop-up


To use this plugin you must first make a popup (register?) at their website. So that's a no no. Another company trying to horde in on your server.


ThickBox Content vs Pop-up