Arevico

<h4>This plugins isn’t maintained anymore. It will be replaces by a new plugin with more functionality, better code quality and better support.</h4>
Multi Functional Flexi Lightbox: Imagine all lightbox uses you can think off. Imagine what effects this can have too you traffic.
<h4>Features</h4>
With this plugin you can: 
 * Promote blog post with an higher adsense EPC 
 * Display a opt-in form in a lightbox 
 * Advertise Clickbank/LinkShare/Amazon and other affiliate products 
 * Put a facebook button in a lightbox, to get a bigger social media footprint 
 * Put in any other html code
You will have to find the appropiate code, banner, etc yourself. Contact arevico support if you need help with this.

Multi Functional Flexi Lightbox

This plugins isn't maintained anymore. It will be replaces by a new plugin with more functionality, better code quality and better support.

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.


Multi Functional Flexi Lightbox vs Pop-up