DevriX

The plugin creates a shortcode for displaying animated RSS feeds, based on Feeds URL.

DX RSS Feed

The plugin creates a shortcode for displaying animated RSS feeds, based on Feeds URL.

MailerLite

This plugin automatically adds featured images of your posts into the RSS feed.
Features:
<ul>
<li>Automatically adds featured images of your posts into the RSS feed</li>
<li>Choose from all available image sizes</li>
<li>Choose from multiple image alignment options</li>
</ul>

Featured Image in RSS Feed by MailerLite

This plugin automatically adds featured images of your posts into the RSS feed.

DX RSS Feed vs Featured Image in RSS Feed by MailerLite