Neil Mickelson

This plugin allows page authors to easily list any child pages of a given page by simply using a new <code>[childpages]</code> shortcode. A basic list of the children to the page you’re editing will be returned with the shortcode <code>[childpages]</code>. More-complex versions of the shortcode, as described in the Usage section, give you additional control over the output results.
<h3>Usage</h3>
The basic shortcode to get a page list is <code>[childpages]</code>. Wherever you have a need to drop of a list of child pages for the page you’re currently authoring, just enter that code in either the Visual or HTML editor. The list that results will not be shown with a title, will be one level deep, will not exclude any child pages or authors, and will be sorted by page order and then by title.
To list the child pages with a title, use the enclosing form of the shortcode, like this:
<blockquote>
[childpages]List Title[/childpages]
</blockquote>
The text between the opening and closing shortcodes will be the title of the resulting list. It is being passed to the <code>title_li</code> attribute in the <code>wp_list_pages()</code> template tag.
To change the defaults used to format the list, pass the appropriate parameters in your shortcode, like this:
<blockquote>
[childpages depth=2 sort_column=ID]
</blockquote>
The parameters you provide are passed to <code>wp_list_pages()</code>. The following parameters are supported; usage details for these parameters can be found in the WordPress Codex.
<ul>
<li><code>depth</code></li>
<li><code>child_of</code></li>
<li><code>exclude</code></li>
<li><code>echo</code></li>
<li><code>authors</code></li>
<li><code>sort_column</code></li>
</ul>
For more information, visit the plugin’s home page at <a href="http://scottierocket.com/wordpress-stuff/sr-childpages" rel="nofollow ugc">http://scottierocket.com/wordpress-stuff/sr-childpages</a>.

SR-ChildPages

This plugin allows page authors to easily list any child pages of a given page by simply using a new [childpages] shortcode.

Andreas Norman

This plugin simply lists all subpages from a selected parent page (with option do exclude specific pages) in the sidebar. This widget can be placed many times in your sidebar.

SubZane Sub Page List Widget

Lists all subpages from a selected parent page with option do exclude specific pages.

SR-ChildPages vs SubZane Sub Page List Widget