Nikos

KD Quiz adds an admin-friendly custom post type for quiz questions, plus a front-end shortcode that renders an animated flash card interface. The plugin includes:
<ul>
<li>Four default styles with a custom option for bespoke theming.</li>
<li>AJAX-powered question rotation, view tracking, and scoring without page reloads.</li>
<li>Optional automatic insertion based on content headings so you can drop quizzes into long-form articles without shortcodes.</li>
<li>JSON import/export to seed quizzes in bulk from external systems.</li>
</ul>
All user inputs are sanitized, escaped, and routed through WordPress nonces to protect your admin users and visitors. No third-party services are contacted.

KD Quiz – Interactive Quiz

Embed a lightweight, card-style quiz with AJAX rotation and scoring to boost engagement anywhere on your site.

Freemius

Daniele Alessandra

This plugin creates some reaction buttons that could be added to content and comments too.
<h4>Features</h4>
With this plugin you can: 
* Add reactions to posts, pages and attachments! 
* Add reactions to comments. 
* Add reactions to single views and archives. 
* Add Reactions to topics and replies in BBPress
<h4>Customization</h4>
Highly customizable: 
* You can choose between 250 included royalty free icons. 
* You can customize size and color of every icon. 
* You can sort, add, remove and edit every single reaction. 
* Drag’n drop to order reactions globally. 
* Icon collection to choose your favourite reaction icons. 
* Color picker to customize every icon. 
* Choose your favourite blur effect between Blur, Desaturate ot Opacity. 
* Customize icons choosing effect amount percentage.
<h4>Widgets</h4>
<ul>
<li>Display most voted contents choosing one or all reactions.</li>
<li>Display most voted comments choosing one or all reactions.</li>
<li>Display most voted reaction near content title in widget.</li>
</ul>
<h4>Languages</h4>
<ul>
<li>This plugin is fully compatible with localization</li>
<li>.pot file included</li>
<li>WPML Ready</li>
<li>Included sample .po and .mo files (italian translation)</li>
</ul>
<h4>Premium features</h4>
<ul>
<li>Add Reactions to custom post types, WooCommerce Products and BuddyPress’ Activities, Groups and Profiles.</li>
<li>Enable or disable reactions for registered user, unregistered only, or even for specific user roles!</li>
<li>Upload your own images to fully customize your visitors experience.</li>
<li>Gutenberg block to add reactions everywhere into your contents.</li>
</ul>

Da Reactions

Thank you very much for your nice plugin! This is what I was looking for.

Simple but what I needed

This plugin creates some reaction buttons that could be added to content and comments.

KD Quiz – Interactive Quiz vs Da Reactions