julienvdg

Easy way to hide some pages from wp_list_pages output. 
Simply add the custom field ‘hide’ with any value to your page, and this page will no longer appear on the page list. 
You could already do this on the ‘Pages’ widget or by adding the <code>exclude</code> parameter to all your <code>wp_list_pages</code> template tags. But now you can do it directly form the page editor which is, I believe, the best place to do so.
You might want to hide pages if you need some pages to exist but don’t want them to appear on your page list. For instance as <a href="http://www.w3.org/Provider/Style/URI" title="Cool URIs don't change" rel="nofollow ugc">Cool URIs don’t change</a>, but some services have been removed from your site, so you write a page explaining where to go to get the equivalent service now. (not a real redirect, but still useful sometimes). Of course you don’t want this page on your page list, you prefer to only have the new services listed 😉
Unlike other more complex plugins, it uses custom field to avoid adding tables to your database.

Simply Hide Pages

Easy way to hide some pages from wp_list_pages output.

cleancodenz

This plugin allows you to define the custom field to be attached to a page to be excluded from navigation and(or) search results.
As the exclusion is done through highly optimized cached general wordpress query, and queried once for even hierarchical data, this would provide best performance and scalability. 
It is using custom fields without creating field or table, it is done in the most unobtrusive way. 
Pages that have parent and child relationships are fully supported without any hassle.
Any issues: <a href="http://www.cleancode.co.nz/contact" rel="nofollow ugc">contact me</a>.

CleanCodeNZ Exclude Pages Plugin

This is a plugin to hide pages from navigation and/or search results using custom fields, parent and child pages are supported too

Simply Hide Pages vs CleanCodeNZ Exclude Pages Plugin