Lazy carousel is an really nice carousel, super lightweight plugin for your wordpress website.
Displays the most visited posts as a widget using data from Google Analytics. Designed to be used under high-traffic or low server resources.
A simple horizontal posts content slider plugin.
One of the best widget plugin for showing Popular Posts in WordPress.Easy to install and use
This plugin makes the list of the most popular 10 posts which you can see in sidebar just by activating it.
WP Most Popular is a simple plugin which tracks your most popular blog posts based on views and lets you display them in your theme or blog sidebar.