antonshevchuk

Additional – you can use  second time (for cut full article in full RSS). 
Options available on Settings/Reading page

(a) RSS More

This is a plugin that allows you to additionally export RSS with the full text of the articles. Your reader can now select what RSS he wants to read h …

tepelstreel

The RSS Image Feed doesn’t create a feed of images, but ataches the first image of the post to your feeds. Normally only the content has images showing. With our plugin there will be a clickable image even in the excerpt and in the content there will be only one image instead of all the images of the post. Since version 2.2 it works as a multisite plugin as well.
The plugin was tested up to WP 4.5 It should work with versions down to 2.7 but was never tested on those.

RSS Image Feed

The RSS Image Feed adds the first image of a post to your feeds, even in firefox and even if you only display the excerpt.

(a) RSS More vs RSS Image Feed