WenZe

Category Parent Children Selector is a WordPress plugin that helps you in selecting parent-children categories.
Features include:
<ul>
<li>Button to select all categories. </li>
<li>Button to select all categories including children categories. </li>
<li>Button to select first level of children categories only. </li>
<li>Button to select parent and all its children categories under its sub categetory. </li>
<li>Auto select parent categories when a sub category is selected.</li>
</ul>

Category Parent Children Selector

Helps you in selecting parent-children categories.

ChrisHurst

MyWebsiteAdvisor

use the [children-content] shortcode where you want to display the content of the child pages.
Developer Website: http://MyWebsiteAdvisor.com
Plugin Page: http://mywebsiteadvisor.com/tools/wordpress-plugins/children-content-shortcode/
Video Tutorial: http://mywebsiteadvisor.com/learning/video-tutorials/children-shortcode-plugins-tutorial/
Requirements:
<ul>
<li>WordPress</li>
</ul>
To-do:

Name: Children Content Shortcode Plugin

use the [children-content] shortcode where you want to display the content of the child pages.

Category Parent Children Selector vs Name: Children Content Shortcode Plugin