dainius.kaupaitis

When navigating on pages widget shows links to child pages. If there are no child pages – widget shows „brother“ pages. 
Link of currently viewed page can be styled through CSS. Widget shows nothing if user is browsing Posts (not Pages). 
Admin can configure:
<ul>
<li>widget title</li>
<li>which pages must be excluded</li>
</ul>
Widget can be localized.

DKA Child pages widget

nateomedia

WP-SNAP! (WordPress System for Navigating Alphabetized Posts) creates an alphabetical listing of post titles on a Category or Page template file. Navigation through the listings WP-SNAP! generates is accomplished using the alphabet itself. (For example, if a site visitor clicked on the letter D, any post titles that began with that letter would be showcased.) WP-SNAP! will work on any WordPress 2.5 or higher site, but is particularly useful managing glossaries, indexes, reviews, or directories.
WP-SNAP! offers three different navigational styles and integration with both custom permalinks and the WordPress loop. Plugin options can be managed both site-wide and on the template itself with results either restricted to one category or broadened to include child categories as well. The clever web developer should have no problem seamlessly integrating WP-SNAP! into their latest project. Options have also been added to allow the customization of css class names and the appearance of html mark-up.

WP-SNAP!

WP-SNAP! (WordPress System for Navigating Alphabetized Posts) creates an user interface for navigating alphabetized post titles.

DKA Child pages widget vs WP-SNAP!