denishua

AideRSS is a service that helps you to prioritize news feeds based on the amount of social activity around them. Using an algorithm called PostRank, which tracks the number of comments, Digg votes, del.icio.us bookmarks and more, it will process any feed you enter and spit out feeds of All Posts, Good Posts, Great Posts, Best Posts and the Top 20.
AideRSS have released API and PHP Class. Base on the PHP Class, I create a simple WordPress plugin which can display the top posts for the specified time period.

AideRSS WordPress Plugin

Show the top posts for your WordPress blog base on AideRSS

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.

AideRSS WordPress Plugin vs RSS Image Feed