Hatsuhito

投稿および固定ページ一覧画面にアイキャッチ画像のサムネイルカラムを追加します。 
アイキャッチ画像がない場合は、ページ一覧から直接アイキャッチを指定できます。
Add a thumbnail column of featured images to the Posts and Pages list screens. 
If a post has no featured image, you can assign one directly from the list view.
<h3>Contact</h3>
<ul>
<li>Author: Hatsuhito Shimizu</li>
<li>Author URI: https://hatsuhito.com/</li>
</ul>

Show Featured Thumbnails

Adds a featured image thumbnail column to the Posts and Pages list screens, and allows assigning an image directly from the list if none exists.

ThemeLamp

Post thumbnail and post list plugin will help you to Show your recent published wordpress post with thumbnail and lists style. Show your post with individual category. No coding required, Mobile friendly and fast performance. You can use this plugin any of your wordpress sidebar widget.
** Plugin Features ** 
This plugin has some awesome options, you customzie from widget settings.
<ul>
<li>Post categories</li>
<li>Post Count</li>
<li>Post order</li>
<li>category Posts</li>
<li>Post date, comments, author</li>
<li>Two Post Layout</li>
<li>3 Flat Colors</li>
</ul>

Post Thumbnail & Post List

Post thumbnail and post list plugin will help you to Show your recent published wordpress post with thumbnail and lists style.

Show Featured Thumbnails vs Post Thumbnail & Post List