dcannon1

Small, lightweight (under 7k) widget that shows posts from the same category as the current post. Several options for customization along with numerous ordering criteria for posts. Displayed only on single post pages. Based on Related Links by Category by Andrew Stephens
Options
<ul>
<li>Title – Set the title of the widget (or leave blank)</li>
<li>Number of Posts to Show – Set how many posts are listed in the widget</li>
<li>Order By – Choose how the related posts will be ordered (including random posts)</li>
<li>Show Category Names – Toggle whether category names are displayed above groups of posts</li>
<li>Link Cat Name to Archive – If category names are being shown, choose to have them link to the category archive page for that category</li>
<li>List Posts Multiple Times? – If a post is classified under multiple categories use this toggle to determine if it will be shown under each category, or only under the first category it shares with the current post. This should be set to no if you are not displaying the category names</li>
</ul>

ThemesVila

BH Related Post is a simple yet powerful plugin that displays related posts using a jCarousel slider. It helps keep users engaged by showcasing other relevant content from the same category, right after or before your post content or comment section.
Built using jQuery and the jCarousel plugin, it is lightweight and compatible across all modern browsers.
<h3>Features</h3>
<ul>
<li>Responsive jCarousel slider</li>
<li>Show posts from the same category</li>
<li>Cross-browser compatible</li>
<li>Lightweight and fast</li>
<li>Display positions: after content, before comments, after comments, or hidden</li>
<li>Admin settings page to control display behavior</li>
<li>Easy to use – just activate and configure</li>
</ul>

BH Related Post

Display related posts with a jCarousel-powered responsive slider. Show posts from the same category in a stylish way.

Related Posts by Category Widget vs BH Related Post