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

John Godley

A very simple plugin that adds a drop-down listbox to the bottom of multi-page posts. The purpose of this box is to allow the user to jump directly to a named page, rather than navigating using page numbers.
<h3>Documentation</h3>
Full documentation can be found on the <a href="http://urbangiraffe.com/plugins/jumpto/" rel="nofollow ugc">Jump To</a> page.

DKA Child pages widget vs Jump To