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

Nitin Yawalkar

DF-Pagination is a simple, flexible and cool pagination plugin which provides users with better navigation on your WordPress site. It has builtin ‘rel=next’ and ‘rel=previous’ markup.
In addition to increasing the user experience for your visitors, it has also been widely reported that pagination increases the SEO of your site by providing more links to your content.
Starting in version 1.0, DF-Pagination can also be used to pagination post comments!
Translations: https://plugins.svn.wordpress.org/df-pagination/I18n (check the version number for the correct file)

DF-Pagination

DF-Pagination is a simple, flexible and cool pagination plugin which provides users with better navigation on your WordPress site.

DKA Child pages widget vs DF-Pagination