ajayver

This plugin gives you the ability to change the appearance of your RSS feed. You can easily add images from custom fields, read more link, category list, tag list and any custom code before or after the feed items. Also, the plugin allows you to delay feed publication for several minutes. It is helpful, when you made some mistake and you will have time to fix it before the post went to RSS and all other services like facebook or twitter.

RSS Manager

This plugin gives you the ability to change the appearance of your RSS feed.

nechehin

Insert links to other posts in content as shortcode and render it with custom template. 
Default template located at wp-content/plugins/relink/templates/readmore.php

Relink

Простой плагин, сделан для разработчиков. Позволяет просто вставить в статью ссылку на другой пост в своем шаблоне и дизайне

Простой плагин, который делает свою работу

Insert links to other posts in content as shortcode and render it with custom template. Default template located at wp-content/plugins/relink/template …

RSS Manager vs Relink