Plugin: Enhancing WordPress RSS feed
WordPress has not just one feed, but many different ones - comments feed, per category, tag, authors, etc. The Atom RSS feed can be found at https://wp.com/feed/atom/. For further information, visit official doc at WordPress RSS Feeds.
Add image to feed
GN Publisher: Google News Compatible RSS Feeds
Featured Image in RSS Feed by MailerLite
Thumbnail for Feeds is a real open-source plugin, with useful hooks information on its repo wearerequired/wp-feed-post-thumbnail. The uniqueness is in fact that the image is added using the MRSS specification - explained in this issue - as in the Media RSS Specification
RSS Featured Image od priznatog autora SB RSS feed plus davno nije updateovan. Send Images to RSS Img To RSS RSS Image Feed RSS with Images CS Add Featured Image to RSS Feed Add Featured Image to RSS Feed Featured images in RSS feed — RSS Chimp MediaRSS with Post Thumbnail
Feed for any post type
By default, the feed is generated only for posts, not for pages or custom post types, so the following plugins enable exactly that.
RSS Includes Pages Posts RSS Feeds WP Custom Post RSS Feed
Interesantni i korisni za feed
Delay Posts From Appearing in WordPress RSS Feed
RSS Redirect & Feedburner Alternative Category Specific RSS feed Subscription
JSON Feed (jsonfeed.org) Feed JSON JSON feed JSON Feeder
RSS Readers
WordPress Reader RSSOwl - Powerful RSS / RDF / Atom News Feed Reader