Amie

This widget replaces the standard Blogroll widget, and adds the following features:
<ul>
<li>API compatibility, so the widget matches the theme</li>
<li>Respects options set in the Links Manager Admin Panel</li>
</ul>

WPW-Linkslist

A flexible replacement for the standard links widget, for wordpress 2.0.x only.

Juanjo Fernández

This plugin allows you to easily display the links included in your <a href="http://linkex.dk/" title="LinkEX" rel="nofollow ugc">LinkEX</a> installation directly in a WordPress widget. 
You can separate your links in different categories and display them on multiple widgets with different titles and designs.

WP-LinkEX

This plugin allows you to easily display the links included in your LinkEX installation directly in a WordPress widget.

WPW-Linkslist vs WP-LinkEX