Peter Wooster

This plugin allows authors to restrict the users’s access to individual pages, posts and menu items based on the user’s logged in status.
Features for Authors
<ul>
<li>You can restrict pages and posts while editing by using the “Simple Access Control” widget.</li>
<li>You can set the message displayed when a visitor accesses a locked page using the “Simple Access Control” item in the Settings menu</li>
<li>The locked status is shown in the admin page and post lists</li>
<li>a “Loggedin Text” widget is available that only displays text to logged in users</li>
<li>You can set an option to display the menu even when filtered</li>
<li>You can set an option to force a 404 Not Found error on direct access to a restricted page</li>
</ul>
Features seen by users
<ul>
<li>Locked pages and posts are not displayed</li>
<li>Locked items are removed from standard and custom menus</li>
<li>A message asking you to log in is displayed if you access it directly using its address or using the next and previous links</li>
<li>A 404 Not Found error may be displayed on access to a restricted page</li>
<li>A login/logout link is displayed in the mesage</li>
<li>Loggedin Text widgets are not visible</li>
<li>Pages and posts can be hidden from either logged in or not logged in users </li>
</ul>
Additional Features
There are no additional features supported by Simple Access Control. The code is simple, small and well documented, 
so you can use it as a starting point for your own access control plugin.

Simple Access Control

Well thought out -- uses filters to hide selected pages and menu items.

A bit more documentation would be nice though -- it took me a while to find the extra check boxes on the right hand side of the post/page editing form.

Excellent

A very simple plugin that hides specific pages, posts and menu items from users based on their logged in staus.

Martin Tod

A quick way to show a set of the pages in a particular part of your site without having to show all the pages on the site.
Adds a widget to let you show a clickable list of pages linked to a particular ‘parent’ page on your site.

Sub Page Hierarchy Widget

An easy widget to let you show a clickable list of pages linked to a particular 'parent' page on your site

Simple Access Control vs Sub Page Hierarchy Widget