George Stephanis

Sure, WordPress has a widget for displaying your most recent posts, but what if you want to only display the posts from a single category in a widget, and not everything? This plugin Widget lets you set the title, category, and quantity of posts to display, then it kicks out a list of the most recent posts in that category.

Recent Category Posts Widget

This widget will let you display a list of the most recent posts in a single category in your sidebar.

sinan isler

This plugin add a widget to the widgets zone.
You can configure the widget for show custom category posts, 
custom post types posts and what you image with that.
Simple and easy to use.
Thanks for using
Features (en_EN):
<ul>
<li>You can show last posts on a category (slug name or id)</li>
<li>You can show last posts custom post types. (post type name)</li>
<li>You can show multiple posts as many as you want (custom number)</li>
<li>You can show multiple post type with seperating commas.</li>
</ul>
Özellikler (tr_TR):
<ul>
<li>Kategorilere göre son yazılar gösterebilrisiniz. (slug name veya id)</li>
<li>Özel yazı tipine göre son yazılar gösterebilirsiniz.</li>
<li>Çoklu özel yazı tipine göre son yazılar gösterebilirsiniz.</li>
</ul>
<a href="http://www.sinanisler.com/" rel="nofollow ugc">WordPress Tema</a>
<h3>Arbitrary section</h3>
None

Last Posts Category and Post Types

You can configure the widget for show custom category posts, custom post types posts and what you image with that.

Recent Category Posts Widget vs Last Posts Category and Post Types