This Related Posts Plugin for WordPress displays links to a given number of Posts that are related to the current post(s) by Tags or Categories. It can Automatically add links to Related Posts at the bottom of every Post or you can drop the Widget on your sidebar.
Settings: Excluding posts, categories, and tags; section heading; number of links; display post date; and excerpts.

EZ Related Posts Footer Links and Widget

Display a linked list of related Posts by Tags or Categories at the bottom of every post or on the sidebar. Options to show Post Date and Excerpts.

shisuh

This is a good-design and responsive related page plugin. 
If you do not want fix design by yourself or you want to increase PV , this plugin is for you.
Features
1.Inspite of you set different aspect ratio thumbnails , posts line-up exactly horizontal as yahoo-tech.
better design for:Gadget,Gourmet,Viral Media
2.Infinity scroll increase count of impression as twitter or facebook
increase pv for:website has many posts
3.Good designed for Smartphone / Tablet / PC
increase ov for:website has pc , tablet , smartphone users
Technical Features
This plugin do not delay load , because javascript load posts from our server after load post.
(Japanese Below)
関連ページをいい感じの見た目でレコメンドするツールです。
関連ページのデザイン崩れを放置している方、閲覧数を増やしたいメディアやブロガー様にお使い頂いております。
３つの特徴と用途
・タテ・ヨコ比が違ってもきれいに並ぶ
見た目が向上するサイト：ガジェット・グルメ・バイラルメディア
・スクロールで多くの記事を推薦できる
PV増が期待出来るサイト：テキスト中心、画像中心、記事数が多い
・スマホ / PC / タブレットあらゆるサイズのデバイス対応
PV増が期待出来るサイト：制作系、検索に強い、PCでもアクセスされやすい

EZ Related Posts Footer Links and Widget vs Related Posts Line-up-Exactly by Milliard