todoespacoonline

This plugin allows you to create simple modals in your site/blog. You can put any custom HTML and CSS inside your modal, like subscription forms, warnings, advertisement, simple text, or whatever you want. It’s really simple.

Tutsup Modal

This plugin allows you to create simple modals in your site/blog.

NoreWP

Avi Bashari

Lou | Digital Marketing

PopBox for Elementor allows the creation of beautiful templates with Elementor Page Builder for use with the included Popbox overlay script.
An Admin menu will be added on your WordPress Dashboard sidepane named PopBoxes. This is the custom post type (CPT) you’ll use to create the content of the PopBoxs.
A custom module will also be added to Elementor Page Builder edit screen to be used for the customization of the trigger button embedded on your page. 
Simply select one of the PopBox content created via the CPT to be shown when the trigger button is clicked.
WP Elevation Studio Troy Dean shows us how to use PopBox for Elementor to create easy and stunning popup forms:
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/IFOGbLsAgo4?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

PopBox For Elementor

Didn't work for me...

Errors out on a GA javascript error even though i have it turned off

When the button is clicked, it shows a backdrop but no modal content.

Its a pity really, this could've really worked

Didn't Work

Adds a popup modal widget for Elementor Page Builder.

Tutsup Modal vs PopBox For Elementor